Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
61baf725 | 2 | Copyright (C) 1995-2017 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
de0d863e | 23 | #include "tdesc.h" |
b20a6524 | 24 | #include "rsp-low.h" |
f348d89a | 25 | #include "signals-state-save-restore.h" |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 28 | #include "gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
602e3198 | 46 | #include "filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
533b0600 | 48 | #include "hostio.h" |
276d4552 | 49 | #include <inttypes.h> |
2090129c SDJ |
50 | #include "common-inferior.h" |
51 | #include "nat/fork-inferior.h" | |
52 | #include "environ.h" | |
957f3f49 DE |
53 | #ifndef ELFMAG0 |
54 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
55 | then ELFMAG0 will have been defined. If it didn't get included by | |
56 | gdb_proc_service.h then including it will likely introduce a duplicate | |
57 | definition of elf_fpregset_t. */ | |
58 | #include <elf.h> | |
59 | #endif | |
14d2069a | 60 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
61 | |
62 | #ifndef SPUFS_MAGIC | |
63 | #define SPUFS_MAGIC 0x23c9b64e | |
64 | #endif | |
da6d8c04 | 65 | |
03583c20 UW |
66 | #ifdef HAVE_PERSONALITY |
67 | # include <sys/personality.h> | |
68 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
69 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
70 | # endif | |
71 | #endif | |
72 | ||
fd462a61 DJ |
73 | #ifndef O_LARGEFILE |
74 | #define O_LARGEFILE 0 | |
75 | #endif | |
1a981360 | 76 | |
db0dfaa0 LM |
77 | /* Some targets did not define these ptrace constants from the start, |
78 | so gdbserver defines them locally here. In the future, these may | |
79 | be removed after they are added to asm/ptrace.h. */ | |
80 | #if !(defined(PT_TEXT_ADDR) \ | |
81 | || defined(PT_DATA_ADDR) \ | |
82 | || defined(PT_TEXT_END_ADDR)) | |
83 | #if defined(__mcoldfire__) | |
84 | /* These are still undefined in 3.10 kernels. */ | |
85 | #define PT_TEXT_ADDR 49*4 | |
86 | #define PT_DATA_ADDR 50*4 | |
87 | #define PT_TEXT_END_ADDR 51*4 | |
88 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
89 | #elif defined(BFIN) | |
90 | #define PT_TEXT_ADDR 220 | |
91 | #define PT_TEXT_END_ADDR 224 | |
92 | #define PT_DATA_ADDR 228 | |
93 | /* These are still undefined in 3.10 kernels. */ | |
94 | #elif defined(__TMS320C6X__) | |
95 | #define PT_TEXT_ADDR (0x10000*4) | |
96 | #define PT_DATA_ADDR (0x10004*4) | |
97 | #define PT_TEXT_END_ADDR (0x10008*4) | |
98 | #endif | |
99 | #endif | |
100 | ||
9accd112 | 101 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 102 | # include "nat/linux-btrace.h" |
734b0e4b | 103 | # include "btrace-common.h" |
9accd112 MM |
104 | #endif |
105 | ||
8365dcf5 TJB |
106 | #ifndef HAVE_ELF32_AUXV_T |
107 | /* Copied from glibc's elf.h. */ | |
108 | typedef struct | |
109 | { | |
110 | uint32_t a_type; /* Entry type */ | |
111 | union | |
112 | { | |
113 | uint32_t a_val; /* Integer value */ | |
114 | /* We use to have pointer elements added here. We cannot do that, | |
115 | though, since it does not work when using 32-bit definitions | |
116 | on 64-bit platforms and vice versa. */ | |
117 | } a_un; | |
118 | } Elf32_auxv_t; | |
119 | #endif | |
120 | ||
121 | #ifndef HAVE_ELF64_AUXV_T | |
122 | /* Copied from glibc's elf.h. */ | |
123 | typedef struct | |
124 | { | |
125 | uint64_t a_type; /* Entry type */ | |
126 | union | |
127 | { | |
128 | uint64_t a_val; /* Integer value */ | |
129 | /* We use to have pointer elements added here. We cannot do that, | |
130 | though, since it does not work when using 32-bit definitions | |
131 | on 64-bit platforms and vice versa. */ | |
132 | } a_un; | |
133 | } Elf64_auxv_t; | |
134 | #endif | |
135 | ||
ded48a5e YQ |
136 | /* Does the current host support PTRACE_GETREGSET? */ |
137 | int have_ptrace_getregset = -1; | |
138 | ||
cff068da GB |
139 | /* LWP accessors. */ |
140 | ||
141 | /* See nat/linux-nat.h. */ | |
142 | ||
143 | ptid_t | |
144 | ptid_of_lwp (struct lwp_info *lwp) | |
145 | { | |
146 | return ptid_of (get_lwp_thread (lwp)); | |
147 | } | |
148 | ||
149 | /* See nat/linux-nat.h. */ | |
150 | ||
4b134ca1 GB |
151 | void |
152 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
153 | struct arch_lwp_info *info) | |
154 | { | |
155 | lwp->arch_private = info; | |
156 | } | |
157 | ||
158 | /* See nat/linux-nat.h. */ | |
159 | ||
160 | struct arch_lwp_info * | |
161 | lwp_arch_private_info (struct lwp_info *lwp) | |
162 | { | |
163 | return lwp->arch_private; | |
164 | } | |
165 | ||
166 | /* See nat/linux-nat.h. */ | |
167 | ||
cff068da GB |
168 | int |
169 | lwp_is_stopped (struct lwp_info *lwp) | |
170 | { | |
171 | return lwp->stopped; | |
172 | } | |
173 | ||
174 | /* See nat/linux-nat.h. */ | |
175 | ||
176 | enum target_stop_reason | |
177 | lwp_stop_reason (struct lwp_info *lwp) | |
178 | { | |
179 | return lwp->stop_reason; | |
180 | } | |
181 | ||
0e00e962 AA |
182 | /* See nat/linux-nat.h. */ |
183 | ||
184 | int | |
185 | lwp_is_stepping (struct lwp_info *lwp) | |
186 | { | |
187 | return lwp->stepping; | |
188 | } | |
189 | ||
05044653 PA |
190 | /* A list of all unknown processes which receive stop signals. Some |
191 | other process will presumably claim each of these as forked | |
192 | children momentarily. */ | |
24a09b5f | 193 | |
05044653 PA |
194 | struct simple_pid_list |
195 | { | |
196 | /* The process ID. */ | |
197 | int pid; | |
198 | ||
199 | /* The status as reported by waitpid. */ | |
200 | int status; | |
201 | ||
202 | /* Next in chain. */ | |
203 | struct simple_pid_list *next; | |
204 | }; | |
205 | struct simple_pid_list *stopped_pids; | |
206 | ||
207 | /* Trivial list manipulation functions to keep track of a list of new | |
208 | stopped processes. */ | |
209 | ||
210 | static void | |
211 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
212 | { | |
8d749320 | 213 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
214 | |
215 | new_pid->pid = pid; | |
216 | new_pid->status = status; | |
217 | new_pid->next = *listp; | |
218 | *listp = new_pid; | |
219 | } | |
220 | ||
221 | static int | |
222 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
223 | { | |
224 | struct simple_pid_list **p; | |
225 | ||
226 | for (p = listp; *p != NULL; p = &(*p)->next) | |
227 | if ((*p)->pid == pid) | |
228 | { | |
229 | struct simple_pid_list *next = (*p)->next; | |
230 | ||
231 | *statusp = (*p)->status; | |
232 | xfree (*p); | |
233 | *p = next; | |
234 | return 1; | |
235 | } | |
236 | return 0; | |
237 | } | |
24a09b5f | 238 | |
bde24c0a PA |
239 | enum stopping_threads_kind |
240 | { | |
241 | /* Not stopping threads presently. */ | |
242 | NOT_STOPPING_THREADS, | |
243 | ||
244 | /* Stopping threads. */ | |
245 | STOPPING_THREADS, | |
246 | ||
247 | /* Stopping and suspending threads. */ | |
248 | STOPPING_AND_SUSPENDING_THREADS | |
249 | }; | |
250 | ||
251 | /* This is set while stop_all_lwps is in effect. */ | |
252 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
253 | |
254 | /* FIXME make into a target method? */ | |
24a09b5f | 255 | int using_threads = 1; |
24a09b5f | 256 | |
fa593d66 PA |
257 | /* True if we're presently stabilizing threads (moving them out of |
258 | jump pads). */ | |
259 | static int stabilizing_threads; | |
260 | ||
2acc282a | 261 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 262 | int step, int signal, siginfo_t *info); |
2bd7c093 | 263 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
264 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
265 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
f50bf8e5 | 266 | static void unsuspend_all_lwps (struct lwp_info *except); |
fa96cb38 PA |
267 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
268 | int *wstat, int options); | |
95954743 | 269 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 270 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 271 | static void linux_mourn (struct process_info *process); |
c35fafde | 272 | static int linux_stopped_by_watchpoint (void); |
95954743 | 273 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 274 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 275 | static void proceed_all_lwps (void); |
d50171e4 | 276 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 277 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
278 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
279 | static void complete_ongoing_step_over (void); | |
ece66d65 | 280 | static int linux_low_ptrace_options (int attached); |
ced2dffb | 281 | static int check_ptrace_stopped_lwp_gone (struct lwp_info *lp); |
9c80ecd6 | 282 | static int proceed_one_lwp (thread_info *thread, void *except); |
d50171e4 | 283 | |
582511be PA |
284 | /* When the event-loop is doing a step-over, this points at the thread |
285 | being stepped. */ | |
286 | ptid_t step_over_bkpt; | |
287 | ||
7d00775e | 288 | /* True if the low target can hardware single-step. */ |
d50171e4 PA |
289 | |
290 | static int | |
291 | can_hardware_single_step (void) | |
292 | { | |
7d00775e AT |
293 | if (the_low_target.supports_hardware_single_step != NULL) |
294 | return the_low_target.supports_hardware_single_step (); | |
295 | else | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* True if the low target can software single-step. Such targets | |
fa5308bd | 300 | implement the GET_NEXT_PCS callback. */ |
7d00775e AT |
301 | |
302 | static int | |
303 | can_software_single_step (void) | |
304 | { | |
fa5308bd | 305 | return (the_low_target.get_next_pcs != NULL); |
d50171e4 PA |
306 | } |
307 | ||
308 | /* True if the low target supports memory breakpoints. If so, we'll | |
309 | have a GET_PC implementation. */ | |
310 | ||
311 | static int | |
312 | supports_breakpoints (void) | |
313 | { | |
314 | return (the_low_target.get_pc != NULL); | |
315 | } | |
0d62e5e8 | 316 | |
fa593d66 PA |
317 | /* Returns true if this target can support fast tracepoints. This |
318 | does not mean that the in-process agent has been loaded in the | |
319 | inferior. */ | |
320 | ||
321 | static int | |
322 | supports_fast_tracepoints (void) | |
323 | { | |
324 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
325 | } | |
326 | ||
c2d6af84 PA |
327 | /* True if LWP is stopped in its stepping range. */ |
328 | ||
329 | static int | |
330 | lwp_in_step_range (struct lwp_info *lwp) | |
331 | { | |
332 | CORE_ADDR pc = lwp->stop_pc; | |
333 | ||
334 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
335 | } | |
336 | ||
0d62e5e8 DJ |
337 | struct pending_signals |
338 | { | |
339 | int signal; | |
32ca6d61 | 340 | siginfo_t info; |
0d62e5e8 DJ |
341 | struct pending_signals *prev; |
342 | }; | |
611cb4a5 | 343 | |
bd99dc85 PA |
344 | /* The read/write ends of the pipe registered as waitable file in the |
345 | event loop. */ | |
346 | static int linux_event_pipe[2] = { -1, -1 }; | |
347 | ||
348 | /* True if we're currently in async mode. */ | |
349 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
350 | ||
02fc4de7 | 351 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 352 | static void wait_for_sigstop (void); |
bd99dc85 | 353 | |
d0722149 DE |
354 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
355 | ||
356 | static int | |
214d508e | 357 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 358 | { |
214d508e L |
359 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
360 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
361 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
362 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
363 | { | |
364 | *machine = header->e_machine; | |
365 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
366 | ||
367 | } | |
368 | *machine = EM_NONE; | |
369 | return -1; | |
d0722149 DE |
370 | } |
371 | ||
372 | /* Return non-zero if FILE is a 64-bit ELF file, | |
373 | zero if the file is not a 64-bit ELF file, | |
374 | and -1 if the file is not accessible or doesn't exist. */ | |
375 | ||
be07f1a2 | 376 | static int |
214d508e | 377 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 378 | { |
957f3f49 | 379 | Elf64_Ehdr header; |
d0722149 DE |
380 | int fd; |
381 | ||
382 | fd = open (file, O_RDONLY); | |
383 | if (fd < 0) | |
384 | return -1; | |
385 | ||
386 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
387 | { | |
388 | close (fd); | |
389 | return 0; | |
390 | } | |
391 | close (fd); | |
392 | ||
214d508e | 393 | return elf_64_header_p (&header, machine); |
d0722149 DE |
394 | } |
395 | ||
be07f1a2 PA |
396 | /* Accepts an integer PID; Returns true if the executable PID is |
397 | running is a 64-bit ELF file.. */ | |
398 | ||
399 | int | |
214d508e | 400 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 401 | { |
d8d2a3ee | 402 | char file[PATH_MAX]; |
be07f1a2 PA |
403 | |
404 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 405 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
406 | } |
407 | ||
bd99dc85 PA |
408 | static void |
409 | delete_lwp (struct lwp_info *lwp) | |
410 | { | |
fa96cb38 PA |
411 | struct thread_info *thr = get_lwp_thread (lwp); |
412 | ||
413 | if (debug_threads) | |
414 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
415 | ||
416 | remove_thread (thr); | |
466eecee SM |
417 | |
418 | if (the_low_target.delete_thread != NULL) | |
419 | the_low_target.delete_thread (lwp->arch_private); | |
420 | else | |
421 | gdb_assert (lwp->arch_private == NULL); | |
422 | ||
bd99dc85 PA |
423 | free (lwp); |
424 | } | |
425 | ||
95954743 PA |
426 | /* Add a process to the common process list, and set its private |
427 | data. */ | |
428 | ||
429 | static struct process_info * | |
430 | linux_add_process (int pid, int attached) | |
431 | { | |
432 | struct process_info *proc; | |
433 | ||
95954743 | 434 | proc = add_process (pid, attached); |
8d749320 | 435 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 436 | |
aa5ca48f | 437 | if (the_low_target.new_process != NULL) |
fe978cb0 | 438 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 439 | |
95954743 PA |
440 | return proc; |
441 | } | |
442 | ||
582511be PA |
443 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
444 | ||
ece66d65 | 445 | /* Call the target arch_setup function on the current thread. */ |
94585166 DB |
446 | |
447 | static void | |
448 | linux_arch_setup (void) | |
449 | { | |
450 | the_low_target.arch_setup (); | |
451 | } | |
452 | ||
453 | /* Call the target arch_setup function on THREAD. */ | |
454 | ||
455 | static void | |
456 | linux_arch_setup_thread (struct thread_info *thread) | |
457 | { | |
458 | struct thread_info *saved_thread; | |
459 | ||
460 | saved_thread = current_thread; | |
461 | current_thread = thread; | |
462 | ||
463 | linux_arch_setup (); | |
464 | ||
465 | current_thread = saved_thread; | |
466 | } | |
467 | ||
468 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
469 | fork, or vfork event, we need to add the new LWP to our list | |
470 | (and return 0 so as not to report the trap to higher layers). | |
471 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
472 | to a new LWP representing the new program. */ | |
0d62e5e8 | 473 | |
de0d863e | 474 | static int |
94585166 | 475 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 476 | { |
94585166 | 477 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 478 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 479 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 480 | struct lwp_info *new_lwp; |
24a09b5f | 481 | |
65706a29 PA |
482 | gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
483 | ||
82075af2 JS |
484 | /* All extended events we currently use are mid-syscall. Only |
485 | PTRACE_EVENT_STOP is delivered more like a signal-stop, but | |
486 | you have to be using PTRACE_SEIZE to get that. */ | |
487 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
488 | ||
c269dbdb DB |
489 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
490 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 491 | { |
95954743 | 492 | ptid_t ptid; |
24a09b5f | 493 | unsigned long new_pid; |
05044653 | 494 | int ret, status; |
24a09b5f | 495 | |
de0d863e | 496 | /* Get the pid of the new lwp. */ |
d86d4aaf | 497 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 498 | &new_pid); |
24a09b5f DJ |
499 | |
500 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 501 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
502 | { |
503 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
504 | hits the SIGSTOP, but we're already attached. */ | |
505 | ||
97438e3f | 506 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
507 | |
508 | if (ret == -1) | |
509 | perror_with_name ("waiting for new child"); | |
510 | else if (ret != new_pid) | |
511 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 512 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
513 | warning ("wait returned unexpected status 0x%x", status); |
514 | } | |
515 | ||
c269dbdb | 516 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
517 | { |
518 | struct process_info *parent_proc; | |
519 | struct process_info *child_proc; | |
520 | struct lwp_info *child_lwp; | |
bfacd19d | 521 | struct thread_info *child_thr; |
de0d863e DB |
522 | struct target_desc *tdesc; |
523 | ||
524 | ptid = ptid_build (new_pid, new_pid, 0); | |
525 | ||
526 | if (debug_threads) | |
527 | { | |
528 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
529 | "new child is %d\n", | |
530 | ptid_get_lwp (ptid_of (event_thr)), | |
531 | ptid_get_pid (ptid)); | |
532 | } | |
533 | ||
534 | /* Add the new process to the tables and clone the breakpoint | |
535 | lists of the parent. We need to do this even if the new process | |
536 | will be detached, since we will need the process object and the | |
537 | breakpoints to remove any breakpoints from memory when we | |
538 | detach, and the client side will access registers. */ | |
539 | child_proc = linux_add_process (new_pid, 0); | |
540 | gdb_assert (child_proc != NULL); | |
541 | child_lwp = add_lwp (ptid); | |
542 | gdb_assert (child_lwp != NULL); | |
543 | child_lwp->stopped = 1; | |
bfacd19d DB |
544 | child_lwp->must_set_ptrace_flags = 1; |
545 | child_lwp->status_pending_p = 0; | |
546 | child_thr = get_lwp_thread (child_lwp); | |
547 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
548 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
549 | ||
863d01bd | 550 | /* If we're suspending all threads, leave this one suspended |
0f8288ae YQ |
551 | too. If the fork/clone parent is stepping over a breakpoint, |
552 | all other threads have been suspended already. Leave the | |
553 | child suspended too. */ | |
554 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
555 | || event_lwp->bp_reinsert != 0) | |
863d01bd PA |
556 | { |
557 | if (debug_threads) | |
558 | debug_printf ("HEW: leaving child suspended\n"); | |
559 | child_lwp->suspended = 1; | |
560 | } | |
561 | ||
de0d863e DB |
562 | parent_proc = get_thread_process (event_thr); |
563 | child_proc->attached = parent_proc->attached; | |
2e7b624b YQ |
564 | |
565 | if (event_lwp->bp_reinsert != 0 | |
566 | && can_software_single_step () | |
567 | && event == PTRACE_EVENT_VFORK) | |
568 | { | |
3b9a79ef YQ |
569 | /* If we leave single-step breakpoints there, child will |
570 | hit it, so uninsert single-step breakpoints from parent | |
2e7b624b YQ |
571 | (and child). Once vfork child is done, reinsert |
572 | them back to parent. */ | |
3b9a79ef | 573 | uninsert_single_step_breakpoints (event_thr); |
2e7b624b YQ |
574 | } |
575 | ||
63c40ec7 | 576 | clone_all_breakpoints (child_thr, event_thr); |
de0d863e | 577 | |
cc397f3a | 578 | tdesc = allocate_target_description (); |
de0d863e DB |
579 | copy_target_description (tdesc, parent_proc->tdesc); |
580 | child_proc->tdesc = tdesc; | |
de0d863e | 581 | |
3a8a0396 DB |
582 | /* Clone arch-specific process data. */ |
583 | if (the_low_target.new_fork != NULL) | |
584 | the_low_target.new_fork (parent_proc, child_proc); | |
585 | ||
de0d863e | 586 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
587 | if (event == PTRACE_EVENT_FORK) |
588 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
589 | else if (event == PTRACE_EVENT_VFORK) | |
590 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
591 | ||
de0d863e | 592 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 593 | |
de0d863e DB |
594 | /* The status_pending field contains bits denoting the |
595 | extended event, so when the pending event is handled, | |
596 | the handler will look at lwp->waitstatus. */ | |
597 | event_lwp->status_pending_p = 1; | |
598 | event_lwp->status_pending = wstat; | |
599 | ||
5a04c4cf PA |
600 | /* Link the threads until the parent event is passed on to |
601 | higher layers. */ | |
602 | event_lwp->fork_relative = child_lwp; | |
603 | child_lwp->fork_relative = event_lwp; | |
604 | ||
3b9a79ef YQ |
605 | /* If the parent thread is doing step-over with single-step |
606 | breakpoints, the list of single-step breakpoints are cloned | |
2e7b624b YQ |
607 | from the parent's. Remove them from the child process. |
608 | In case of vfork, we'll reinsert them back once vforked | |
609 | child is done. */ | |
8a81c5d7 | 610 | if (event_lwp->bp_reinsert != 0 |
2e7b624b | 611 | && can_software_single_step ()) |
8a81c5d7 | 612 | { |
8a81c5d7 YQ |
613 | /* The child process is forked and stopped, so it is safe |
614 | to access its memory without stopping all other threads | |
615 | from other processes. */ | |
3b9a79ef | 616 | delete_single_step_breakpoints (child_thr); |
8a81c5d7 | 617 | |
3b9a79ef YQ |
618 | gdb_assert (has_single_step_breakpoints (event_thr)); |
619 | gdb_assert (!has_single_step_breakpoints (child_thr)); | |
8a81c5d7 YQ |
620 | } |
621 | ||
de0d863e DB |
622 | /* Report the event. */ |
623 | return 0; | |
624 | } | |
625 | ||
fa96cb38 PA |
626 | if (debug_threads) |
627 | debug_printf ("HEW: Got clone event " | |
628 | "from LWP %ld, new child is LWP %ld\n", | |
629 | lwpid_of (event_thr), new_pid); | |
630 | ||
d86d4aaf | 631 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 632 | new_lwp = add_lwp (ptid); |
24a09b5f | 633 | |
e27d73f6 DE |
634 | /* Either we're going to immediately resume the new thread |
635 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
636 | thinks the thread is currently running, so set this first | |
637 | before calling linux_resume_one_lwp. */ | |
638 | new_lwp->stopped = 1; | |
639 | ||
0f8288ae YQ |
640 | /* If we're suspending all threads, leave this one suspended |
641 | too. If the fork/clone parent is stepping over a breakpoint, | |
642 | all other threads have been suspended already. Leave the | |
643 | child suspended too. */ | |
644 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS | |
645 | || event_lwp->bp_reinsert != 0) | |
bde24c0a PA |
646 | new_lwp->suspended = 1; |
647 | ||
da5898ce DJ |
648 | /* Normally we will get the pending SIGSTOP. But in some cases |
649 | we might get another signal delivered to the group first. | |
f21cc1a2 | 650 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 651 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 652 | { |
54a0b537 | 653 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
654 | new_lwp->status_pending_p = 1; |
655 | new_lwp->status_pending = status; | |
da5898ce | 656 | } |
65706a29 PA |
657 | else if (report_thread_events) |
658 | { | |
659 | new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED; | |
660 | new_lwp->status_pending_p = 1; | |
661 | new_lwp->status_pending = status; | |
662 | } | |
de0d863e | 663 | |
94c207e0 | 664 | thread_db_notice_clone (event_thr, ptid); |
86299109 | 665 | |
de0d863e DB |
666 | /* Don't report the event. */ |
667 | return 1; | |
24a09b5f | 668 | } |
c269dbdb DB |
669 | else if (event == PTRACE_EVENT_VFORK_DONE) |
670 | { | |
671 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
672 | ||
2e7b624b YQ |
673 | if (event_lwp->bp_reinsert != 0 && can_software_single_step ()) |
674 | { | |
3b9a79ef | 675 | reinsert_single_step_breakpoints (event_thr); |
2e7b624b | 676 | |
3b9a79ef | 677 | gdb_assert (has_single_step_breakpoints (event_thr)); |
2e7b624b YQ |
678 | } |
679 | ||
c269dbdb DB |
680 | /* Report the event. */ |
681 | return 0; | |
682 | } | |
94585166 DB |
683 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
684 | { | |
685 | struct process_info *proc; | |
f27866ba | 686 | std::vector<int> syscalls_to_catch; |
94585166 DB |
687 | ptid_t event_ptid; |
688 | pid_t event_pid; | |
689 | ||
690 | if (debug_threads) | |
691 | { | |
692 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
693 | lwpid_of (event_thr)); | |
694 | } | |
695 | ||
696 | /* Get the event ptid. */ | |
697 | event_ptid = ptid_of (event_thr); | |
698 | event_pid = ptid_get_pid (event_ptid); | |
699 | ||
82075af2 | 700 | /* Save the syscall list from the execing process. */ |
94585166 | 701 | proc = get_thread_process (event_thr); |
f27866ba | 702 | syscalls_to_catch = std::move (proc->syscalls_to_catch); |
82075af2 JS |
703 | |
704 | /* Delete the execing process and all its threads. */ | |
94585166 DB |
705 | linux_mourn (proc); |
706 | current_thread = NULL; | |
707 | ||
708 | /* Create a new process/lwp/thread. */ | |
709 | proc = linux_add_process (event_pid, 0); | |
710 | event_lwp = add_lwp (event_ptid); | |
711 | event_thr = get_lwp_thread (event_lwp); | |
712 | gdb_assert (current_thread == event_thr); | |
713 | linux_arch_setup_thread (event_thr); | |
714 | ||
715 | /* Set the event status. */ | |
716 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
717 | event_lwp->waitstatus.value.execd_pathname | |
718 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
719 | ||
720 | /* Mark the exec status as pending. */ | |
721 | event_lwp->stopped = 1; | |
722 | event_lwp->status_pending_p = 1; | |
723 | event_lwp->status_pending = wstat; | |
724 | event_thr->last_resume_kind = resume_continue; | |
725 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
726 | ||
82075af2 JS |
727 | /* Update syscall state in the new lwp, effectively mid-syscall too. */ |
728 | event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY; | |
729 | ||
730 | /* Restore the list to catch. Don't rely on the client, which is free | |
731 | to avoid sending a new list when the architecture doesn't change. | |
732 | Also, for ANY_SYSCALL, the architecture doesn't really matter. */ | |
f27866ba | 733 | proc->syscalls_to_catch = std::move (syscalls_to_catch); |
82075af2 | 734 | |
94585166 DB |
735 | /* Report the event. */ |
736 | *orig_event_lwp = event_lwp; | |
737 | return 0; | |
738 | } | |
de0d863e DB |
739 | |
740 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
741 | } |
742 | ||
d50171e4 PA |
743 | /* Return the PC as read from the regcache of LWP, without any |
744 | adjustment. */ | |
745 | ||
746 | static CORE_ADDR | |
747 | get_pc (struct lwp_info *lwp) | |
748 | { | |
0bfdf32f | 749 | struct thread_info *saved_thread; |
d50171e4 PA |
750 | struct regcache *regcache; |
751 | CORE_ADDR pc; | |
752 | ||
753 | if (the_low_target.get_pc == NULL) | |
754 | return 0; | |
755 | ||
0bfdf32f GB |
756 | saved_thread = current_thread; |
757 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 758 | |
0bfdf32f | 759 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
760 | pc = (*the_low_target.get_pc) (regcache); |
761 | ||
762 | if (debug_threads) | |
87ce2a04 | 763 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 764 | |
0bfdf32f | 765 | current_thread = saved_thread; |
d50171e4 PA |
766 | return pc; |
767 | } | |
768 | ||
82075af2 | 769 | /* This function should only be called if LWP got a SYSCALL_SIGTRAP. |
4cc32bec | 770 | Fill *SYSNO with the syscall nr trapped. */ |
82075af2 JS |
771 | |
772 | static void | |
4cc32bec | 773 | get_syscall_trapinfo (struct lwp_info *lwp, int *sysno) |
82075af2 JS |
774 | { |
775 | struct thread_info *saved_thread; | |
776 | struct regcache *regcache; | |
777 | ||
778 | if (the_low_target.get_syscall_trapinfo == NULL) | |
779 | { | |
780 | /* If we cannot get the syscall trapinfo, report an unknown | |
4cc32bec | 781 | system call number. */ |
82075af2 | 782 | *sysno = UNKNOWN_SYSCALL; |
82075af2 JS |
783 | return; |
784 | } | |
785 | ||
786 | saved_thread = current_thread; | |
787 | current_thread = get_lwp_thread (lwp); | |
788 | ||
789 | regcache = get_thread_regcache (current_thread, 1); | |
4cc32bec | 790 | (*the_low_target.get_syscall_trapinfo) (regcache, sysno); |
82075af2 JS |
791 | |
792 | if (debug_threads) | |
4cc32bec | 793 | debug_printf ("get_syscall_trapinfo sysno %d\n", *sysno); |
82075af2 JS |
794 | |
795 | current_thread = saved_thread; | |
796 | } | |
797 | ||
e7ad2f14 | 798 | static int check_stopped_by_watchpoint (struct lwp_info *child); |
0d62e5e8 | 799 | |
e7ad2f14 PA |
800 | /* Called when the LWP stopped for a signal/trap. If it stopped for a |
801 | trap check what caused it (breakpoint, watchpoint, trace, etc.), | |
802 | and save the result in the LWP's stop_reason field. If it stopped | |
803 | for a breakpoint, decrement the PC if necessary on the lwp's | |
804 | architecture. Returns true if we now have the LWP's stop PC. */ | |
0d62e5e8 | 805 | |
582511be | 806 | static int |
e7ad2f14 | 807 | save_stop_reason (struct lwp_info *lwp) |
0d62e5e8 | 808 | { |
582511be PA |
809 | CORE_ADDR pc; |
810 | CORE_ADDR sw_breakpoint_pc; | |
811 | struct thread_info *saved_thread; | |
3e572f71 PA |
812 | #if USE_SIGTRAP_SIGINFO |
813 | siginfo_t siginfo; | |
814 | #endif | |
d50171e4 PA |
815 | |
816 | if (the_low_target.get_pc == NULL) | |
817 | return 0; | |
0d62e5e8 | 818 | |
582511be PA |
819 | pc = get_pc (lwp); |
820 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 821 | |
582511be PA |
822 | /* breakpoint_at reads from the current thread. */ |
823 | saved_thread = current_thread; | |
824 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 825 | |
3e572f71 PA |
826 | #if USE_SIGTRAP_SIGINFO |
827 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
828 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
829 | { | |
830 | if (siginfo.si_signo == SIGTRAP) | |
831 | { | |
e7ad2f14 PA |
832 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code) |
833 | && GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) | |
3e572f71 | 834 | { |
e7ad2f14 PA |
835 | /* The si_code is ambiguous on this arch -- check debug |
836 | registers. */ | |
837 | if (!check_stopped_by_watchpoint (lwp)) | |
838 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
839 | } | |
840 | else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) | |
841 | { | |
842 | /* If we determine the LWP stopped for a SW breakpoint, | |
843 | trust it. Particularly don't check watchpoint | |
844 | registers, because at least on s390, we'd find | |
845 | stopped-by-watchpoint as long as there's a watchpoint | |
846 | set. */ | |
3e572f71 | 847 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
3e572f71 | 848 | } |
e7ad2f14 | 849 | else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code)) |
3e572f71 | 850 | { |
e7ad2f14 PA |
851 | /* This can indicate either a hardware breakpoint or |
852 | hardware watchpoint. Check debug registers. */ | |
853 | if (!check_stopped_by_watchpoint (lwp)) | |
854 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
3e572f71 | 855 | } |
2bf6fb9d PA |
856 | else if (siginfo.si_code == TRAP_TRACE) |
857 | { | |
e7ad2f14 PA |
858 | /* We may have single stepped an instruction that |
859 | triggered a watchpoint. In that case, on some | |
860 | architectures (such as x86), instead of TRAP_HWBKPT, | |
861 | si_code indicates TRAP_TRACE, and we need to check | |
862 | the debug registers separately. */ | |
863 | if (!check_stopped_by_watchpoint (lwp)) | |
864 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 865 | } |
3e572f71 PA |
866 | } |
867 | } | |
868 | #else | |
582511be PA |
869 | /* We may have just stepped a breakpoint instruction. E.g., in |
870 | non-stop mode, GDB first tells the thread A to step a range, and | |
871 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
872 | case we need to report the breakpoint PC. */ |
873 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be | 874 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
e7ad2f14 PA |
875 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
876 | ||
877 | if (hardware_breakpoint_inserted_here (pc)) | |
878 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
879 | ||
880 | if (lwp->stop_reason == TARGET_STOPPED_BY_NO_REASON) | |
881 | check_stopped_by_watchpoint (lwp); | |
882 | #endif | |
883 | ||
884 | if (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) | |
582511be PA |
885 | { |
886 | if (debug_threads) | |
887 | { | |
888 | struct thread_info *thr = get_lwp_thread (lwp); | |
889 | ||
890 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
891 | target_pid_to_str (ptid_of (thr))); | |
892 | } | |
893 | ||
894 | /* Back up the PC if necessary. */ | |
895 | if (pc != sw_breakpoint_pc) | |
e7ad2f14 | 896 | { |
582511be PA |
897 | struct regcache *regcache |
898 | = get_thread_regcache (current_thread, 1); | |
899 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
900 | } | |
901 | ||
e7ad2f14 PA |
902 | /* Update this so we record the correct stop PC below. */ |
903 | pc = sw_breakpoint_pc; | |
582511be | 904 | } |
e7ad2f14 | 905 | else if (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT) |
582511be PA |
906 | { |
907 | if (debug_threads) | |
908 | { | |
909 | struct thread_info *thr = get_lwp_thread (lwp); | |
910 | ||
911 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
912 | target_pid_to_str (ptid_of (thr))); | |
913 | } | |
e7ad2f14 PA |
914 | } |
915 | else if (lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) | |
916 | { | |
917 | if (debug_threads) | |
918 | { | |
919 | struct thread_info *thr = get_lwp_thread (lwp); | |
47c0c975 | 920 | |
e7ad2f14 PA |
921 | debug_printf ("CSBB: %s stopped by hardware watchpoint\n", |
922 | target_pid_to_str (ptid_of (thr))); | |
923 | } | |
582511be | 924 | } |
e7ad2f14 PA |
925 | else if (lwp->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) |
926 | { | |
927 | if (debug_threads) | |
928 | { | |
929 | struct thread_info *thr = get_lwp_thread (lwp); | |
582511be | 930 | |
e7ad2f14 PA |
931 | debug_printf ("CSBB: %s stopped by trace\n", |
932 | target_pid_to_str (ptid_of (thr))); | |
933 | } | |
934 | } | |
935 | ||
936 | lwp->stop_pc = pc; | |
582511be | 937 | current_thread = saved_thread; |
e7ad2f14 | 938 | return 1; |
0d62e5e8 | 939 | } |
ce3a066d | 940 | |
b3312d80 | 941 | static struct lwp_info * |
95954743 | 942 | add_lwp (ptid_t ptid) |
611cb4a5 | 943 | { |
54a0b537 | 944 | struct lwp_info *lwp; |
0d62e5e8 | 945 | |
8d749320 | 946 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
947 | |
948 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 949 | |
aa5ca48f | 950 | if (the_low_target.new_thread != NULL) |
34c703da | 951 | the_low_target.new_thread (lwp); |
aa5ca48f | 952 | |
f7667f0d | 953 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 954 | |
54a0b537 | 955 | return lwp; |
0d62e5e8 | 956 | } |
611cb4a5 | 957 | |
2090129c SDJ |
958 | /* Callback to be used when calling fork_inferior, responsible for |
959 | actually initiating the tracing of the inferior. */ | |
960 | ||
961 | static void | |
962 | linux_ptrace_fun () | |
963 | { | |
964 | if (ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, | |
965 | (PTRACE_TYPE_ARG4) 0) < 0) | |
966 | trace_start_error_with_name ("ptrace"); | |
967 | ||
968 | if (setpgid (0, 0) < 0) | |
969 | trace_start_error_with_name ("setpgid"); | |
970 | ||
971 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
972 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
973 | Also, redirect stdin to /dev/null. */ | |
974 | if (remote_connection_is_stdio ()) | |
975 | { | |
976 | if (close (0) < 0) | |
977 | trace_start_error_with_name ("close"); | |
978 | if (open ("/dev/null", O_RDONLY) < 0) | |
979 | trace_start_error_with_name ("open"); | |
980 | if (dup2 (2, 1) < 0) | |
981 | trace_start_error_with_name ("dup2"); | |
982 | if (write (2, "stdin/stdout redirected\n", | |
983 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
984 | { | |
985 | /* Errors ignored. */; | |
986 | } | |
987 | } | |
988 | } | |
989 | ||
da6d8c04 | 990 | /* Start an inferior process and returns its pid. |
2090129c SDJ |
991 | PROGRAM is the name of the program to be started, and PROGRAM_ARGS |
992 | are its arguments. */ | |
da6d8c04 | 993 | |
ce3a066d | 994 | static int |
2090129c SDJ |
995 | linux_create_inferior (const char *program, |
996 | const std::vector<char *> &program_args) | |
da6d8c04 | 997 | { |
a6dbe5df | 998 | struct lwp_info *new_lwp; |
da6d8c04 | 999 | int pid; |
95954743 | 1000 | ptid_t ptid; |
8cc73a39 SDJ |
1001 | struct cleanup *restore_personality |
1002 | = maybe_disable_address_space_randomization (disable_randomization); | |
2090129c | 1003 | std::string str_program_args = stringify_argv (program_args); |
03583c20 | 1004 | |
2090129c SDJ |
1005 | pid = fork_inferior (program, |
1006 | str_program_args.c_str (), | |
9a6c7d9c | 1007 | get_environ ()->envp (), linux_ptrace_fun, |
2090129c | 1008 | NULL, NULL, NULL, NULL); |
da6d8c04 | 1009 | |
8cc73a39 | 1010 | do_cleanups (restore_personality); |
03583c20 | 1011 | |
55d7b841 | 1012 | linux_add_process (pid, 0); |
95954743 PA |
1013 | |
1014 | ptid = ptid_build (pid, pid, 0); | |
1015 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 1016 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 1017 | |
2090129c SDJ |
1018 | post_fork_inferior (pid, program); |
1019 | ||
a9fa9f7d | 1020 | return pid; |
da6d8c04 DJ |
1021 | } |
1022 | ||
ece66d65 JS |
1023 | /* Implement the post_create_inferior target_ops method. */ |
1024 | ||
1025 | static void | |
1026 | linux_post_create_inferior (void) | |
1027 | { | |
1028 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
1029 | ||
1030 | linux_arch_setup (); | |
1031 | ||
1032 | if (lwp->must_set_ptrace_flags) | |
1033 | { | |
1034 | struct process_info *proc = current_process (); | |
1035 | int options = linux_low_ptrace_options (proc->attached); | |
1036 | ||
1037 | linux_enable_event_reporting (lwpid_of (current_thread), options); | |
1038 | lwp->must_set_ptrace_flags = 0; | |
1039 | } | |
1040 | } | |
1041 | ||
8784d563 PA |
1042 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
1043 | error. */ | |
da6d8c04 | 1044 | |
7ae1a6a6 PA |
1045 | int |
1046 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 1047 | { |
54a0b537 | 1048 | struct lwp_info *new_lwp; |
7ae1a6a6 | 1049 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 1050 | |
b8e1b30e | 1051 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 1052 | != 0) |
7ae1a6a6 | 1053 | return errno; |
24a09b5f | 1054 | |
b3312d80 | 1055 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 1056 | |
a6dbe5df PA |
1057 | /* We need to wait for SIGSTOP before being able to make the next |
1058 | ptrace call on this LWP. */ | |
1059 | new_lwp->must_set_ptrace_flags = 1; | |
1060 | ||
644cebc9 | 1061 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
1062 | { |
1063 | if (debug_threads) | |
87ce2a04 | 1064 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
1065 | |
1066 | /* The process is definitely stopped. It is in a job control | |
1067 | stop, unless the kernel predates the TASK_STOPPED / | |
1068 | TASK_TRACED distinction, in which case it might be in a | |
1069 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1070 | can kill it, signal it, et cetera. | |
1071 | ||
1072 | First make sure there is a pending SIGSTOP. Since we are | |
1073 | already attached, the process can not transition from stopped | |
1074 | to running without a PTRACE_CONT; so we know this signal will | |
1075 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1076 | probably already in the queue (unless this kernel is old | |
1077 | enough to use TASK_STOPPED for ptrace stops); but since | |
1078 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
1079 | kill_lwp (lwpid, SIGSTOP); | |
1080 | ||
1081 | /* Finally, resume the stopped process. This will deliver the | |
1082 | SIGSTOP (or a higher priority signal, just like normal | |
1083 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 1084 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
1085 | } |
1086 | ||
0d62e5e8 | 1087 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
1088 | brings it to a halt. |
1089 | ||
1090 | There are several cases to consider here: | |
1091 | ||
1092 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 1093 | of a new thread that is being created. |
d50171e4 PA |
1094 | In this case we should ignore that SIGSTOP and resume the |
1095 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 1096 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 1097 | resume_continue. |
0e21c1ec DE |
1098 | |
1099 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
1100 | to it via attach_inferior. |
1101 | In this case we want the process thread to stop. | |
d50171e4 PA |
1102 | This is handled by having linux_attach set last_resume_kind == |
1103 | resume_stop after we return. | |
e3deef73 LM |
1104 | |
1105 | If the pid we are attaching to is also the tgid, we attach to and | |
1106 | stop all the existing threads. Otherwise, we attach to pid and | |
1107 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
1108 | |
1109 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
1110 | existing threads. |
1111 | In this case we want the thread to stop. | |
1112 | FIXME: This case is currently not properly handled. | |
1113 | We should wait for the SIGSTOP but don't. Things work apparently | |
1114 | because enough time passes between when we ptrace (ATTACH) and when | |
1115 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
1116 | |
1117 | On the other hand, if we are currently trying to stop all threads, we | |
1118 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 1119 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
1120 | end of the list, and so the new thread has not yet reached |
1121 | wait_for_sigstop (but will). */ | |
d50171e4 | 1122 | new_lwp->stop_expected = 1; |
0d62e5e8 | 1123 | |
7ae1a6a6 | 1124 | return 0; |
95954743 PA |
1125 | } |
1126 | ||
8784d563 PA |
1127 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
1128 | already attached. Returns true if a new LWP is found, false | |
1129 | otherwise. */ | |
1130 | ||
1131 | static int | |
1132 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1133 | { | |
1134 | /* Is this a new thread? */ | |
1135 | if (find_thread_ptid (ptid) == NULL) | |
1136 | { | |
1137 | int lwpid = ptid_get_lwp (ptid); | |
1138 | int err; | |
1139 | ||
1140 | if (debug_threads) | |
1141 | debug_printf ("Found new lwp %d\n", lwpid); | |
1142 | ||
1143 | err = linux_attach_lwp (ptid); | |
1144 | ||
1145 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1146 | is returned if the thread's task still exists, and is marked | |
1147 | as exited or zombie, as well as other conditions, so in that | |
1148 | case, confirm the status in /proc/PID/status. */ | |
1149 | if (err == ESRCH | |
1150 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1151 | { | |
1152 | if (debug_threads) | |
1153 | { | |
1154 | debug_printf ("Cannot attach to lwp %d: " | |
1155 | "thread is gone (%d: %s)\n", | |
1156 | lwpid, err, strerror (err)); | |
1157 | } | |
1158 | } | |
1159 | else if (err != 0) | |
1160 | { | |
1161 | warning (_("Cannot attach to lwp %d: %s"), | |
1162 | lwpid, | |
1163 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1164 | } | |
1165 | ||
1166 | return 1; | |
1167 | } | |
1168 | return 0; | |
1169 | } | |
1170 | ||
500c1d85 PA |
1171 | static void async_file_mark (void); |
1172 | ||
e3deef73 LM |
1173 | /* Attach to PID. If PID is the tgid, attach to it and all |
1174 | of its threads. */ | |
1175 | ||
c52daf70 | 1176 | static int |
a1928bad | 1177 | linux_attach (unsigned long pid) |
0d62e5e8 | 1178 | { |
500c1d85 PA |
1179 | struct process_info *proc; |
1180 | struct thread_info *initial_thread; | |
7ae1a6a6 PA |
1181 | ptid_t ptid = ptid_build (pid, pid, 0); |
1182 | int err; | |
1183 | ||
e3deef73 LM |
1184 | /* Attach to PID. We will check for other threads |
1185 | soon. */ | |
7ae1a6a6 PA |
1186 | err = linux_attach_lwp (ptid); |
1187 | if (err != 0) | |
1188 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1189 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1190 | |
500c1d85 | 1191 | proc = linux_add_process (pid, 1); |
0d62e5e8 | 1192 | |
500c1d85 PA |
1193 | /* Don't ignore the initial SIGSTOP if we just attached to this |
1194 | process. It will be collected by wait shortly. */ | |
1195 | initial_thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1196 | initial_thread->last_resume_kind = resume_stop; | |
0d62e5e8 | 1197 | |
8784d563 PA |
1198 | /* We must attach to every LWP. If /proc is mounted, use that to |
1199 | find them now. On the one hand, the inferior may be using raw | |
1200 | clone instead of using pthreads. On the other hand, even if it | |
1201 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1202 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1203 | structures in the inferior's address space to find the list of | |
1204 | threads/LWPs, and those structures may well be corrupted. Note | |
1205 | that once thread_db is loaded, we'll still use it to list threads | |
1206 | and associate pthread info with each LWP. */ | |
1207 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
500c1d85 PA |
1208 | |
1209 | /* GDB will shortly read the xml target description for this | |
1210 | process, to figure out the process' architecture. But the target | |
1211 | description is only filled in when the first process/thread in | |
1212 | the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do | |
1213 | that now, otherwise, if GDB is fast enough, it could read the | |
1214 | target description _before_ that initial stop. */ | |
1215 | if (non_stop) | |
1216 | { | |
1217 | struct lwp_info *lwp; | |
1218 | int wstat, lwpid; | |
1219 | ptid_t pid_ptid = pid_to_ptid (pid); | |
1220 | ||
1221 | lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid, | |
1222 | &wstat, __WALL); | |
1223 | gdb_assert (lwpid > 0); | |
1224 | ||
1225 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); | |
1226 | ||
1227 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP) | |
1228 | { | |
1229 | lwp->status_pending_p = 1; | |
1230 | lwp->status_pending = wstat; | |
1231 | } | |
1232 | ||
1233 | initial_thread->last_resume_kind = resume_continue; | |
1234 | ||
1235 | async_file_mark (); | |
1236 | ||
1237 | gdb_assert (proc->tdesc != NULL); | |
1238 | } | |
1239 | ||
95954743 PA |
1240 | return 0; |
1241 | } | |
1242 | ||
1243 | struct counter | |
1244 | { | |
1245 | int pid; | |
1246 | int count; | |
1247 | }; | |
1248 | ||
1249 | static int | |
9c80ecd6 | 1250 | second_thread_of_pid_p (thread_info *thread, void *args) |
95954743 | 1251 | { |
9a3c8263 | 1252 | struct counter *counter = (struct counter *) args; |
95954743 | 1253 | |
9c80ecd6 | 1254 | if (thread->id.pid () == counter->pid) |
95954743 PA |
1255 | { |
1256 | if (++counter->count > 1) | |
1257 | return 1; | |
1258 | } | |
d61ddec4 | 1259 | |
da6d8c04 DJ |
1260 | return 0; |
1261 | } | |
1262 | ||
95954743 | 1263 | static int |
fa96cb38 | 1264 | last_thread_of_process_p (int pid) |
95954743 | 1265 | { |
95954743 | 1266 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1267 | |
95954743 PA |
1268 | return (find_inferior (&all_threads, |
1269 | second_thread_of_pid_p, &counter) == NULL); | |
1270 | } | |
1271 | ||
da84f473 PA |
1272 | /* Kill LWP. */ |
1273 | ||
1274 | static void | |
1275 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1276 | { | |
d86d4aaf DE |
1277 | struct thread_info *thr = get_lwp_thread (lwp); |
1278 | int pid = lwpid_of (thr); | |
da84f473 PA |
1279 | |
1280 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1281 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1282 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1283 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1284 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1285 | per process, not one for each thread. But since we still support | |
4a6ed09b PA |
1286 | support debugging programs using raw clone without CLONE_THREAD, |
1287 | we send one for each thread. For years, we used PTRACE_KILL | |
1288 | only, so we're being a bit paranoid about some old kernels where | |
1289 | PTRACE_KILL might work better (dubious if there are any such, but | |
1290 | that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL | |
1291 | second, and so we're fine everywhere. */ | |
da84f473 PA |
1292 | |
1293 | errno = 0; | |
69ff6be5 | 1294 | kill_lwp (pid, SIGKILL); |
da84f473 | 1295 | if (debug_threads) |
ce9e3fe7 PA |
1296 | { |
1297 | int save_errno = errno; | |
1298 | ||
1299 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1300 | target_pid_to_str (ptid_of (thr)), | |
1301 | save_errno ? strerror (save_errno) : "OK"); | |
1302 | } | |
da84f473 PA |
1303 | |
1304 | errno = 0; | |
b8e1b30e | 1305 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1306 | if (debug_threads) |
ce9e3fe7 PA |
1307 | { |
1308 | int save_errno = errno; | |
1309 | ||
1310 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1311 | target_pid_to_str (ptid_of (thr)), | |
1312 | save_errno ? strerror (save_errno) : "OK"); | |
1313 | } | |
da84f473 PA |
1314 | } |
1315 | ||
e76126e8 PA |
1316 | /* Kill LWP and wait for it to die. */ |
1317 | ||
1318 | static void | |
1319 | kill_wait_lwp (struct lwp_info *lwp) | |
1320 | { | |
1321 | struct thread_info *thr = get_lwp_thread (lwp); | |
1322 | int pid = ptid_get_pid (ptid_of (thr)); | |
1323 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1324 | int wstat; | |
1325 | int res; | |
1326 | ||
1327 | if (debug_threads) | |
1328 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1329 | ||
1330 | do | |
1331 | { | |
1332 | linux_kill_one_lwp (lwp); | |
1333 | ||
1334 | /* Make sure it died. Notes: | |
1335 | ||
1336 | - The loop is most likely unnecessary. | |
1337 | ||
1338 | - We don't use linux_wait_for_event as that could delete lwps | |
1339 | while we're iterating over them. We're not interested in | |
1340 | any pending status at this point, only in making sure all | |
1341 | wait status on the kernel side are collected until the | |
1342 | process is reaped. | |
1343 | ||
1344 | - We don't use __WALL here as the __WALL emulation relies on | |
1345 | SIGCHLD, and killing a stopped process doesn't generate | |
1346 | one, nor an exit status. | |
1347 | */ | |
1348 | res = my_waitpid (lwpid, &wstat, 0); | |
1349 | if (res == -1 && errno == ECHILD) | |
1350 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1351 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1352 | ||
586b02a9 PA |
1353 | /* Even if it was stopped, the child may have already disappeared. |
1354 | E.g., if it was killed by SIGKILL. */ | |
1355 | if (res < 0 && errno != ECHILD) | |
1356 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1357 | } |
1358 | ||
da84f473 PA |
1359 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1360 | except the leader. */ | |
95954743 PA |
1361 | |
1362 | static int | |
9c80ecd6 | 1363 | kill_one_lwp_callback (thread_info *thread, void *args) |
da6d8c04 | 1364 | { |
54a0b537 | 1365 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1366 | int pid = * (int *) args; |
1367 | ||
9c80ecd6 | 1368 | if (thread->id.pid () != pid) |
95954743 | 1369 | return 0; |
0d62e5e8 | 1370 | |
fd500816 DJ |
1371 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1372 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1373 | the children get a chance to be reaped, it will remain a zombie | |
1374 | forever. */ | |
95954743 | 1375 | |
d86d4aaf | 1376 | if (lwpid_of (thread) == pid) |
95954743 PA |
1377 | { |
1378 | if (debug_threads) | |
87ce2a04 | 1379 | debug_printf ("lkop: is last of process %s\n", |
9c80ecd6 | 1380 | target_pid_to_str (thread->id)); |
95954743 PA |
1381 | return 0; |
1382 | } | |
fd500816 | 1383 | |
e76126e8 | 1384 | kill_wait_lwp (lwp); |
95954743 | 1385 | return 0; |
da6d8c04 DJ |
1386 | } |
1387 | ||
95954743 PA |
1388 | static int |
1389 | linux_kill (int pid) | |
0d62e5e8 | 1390 | { |
95954743 | 1391 | struct process_info *process; |
54a0b537 | 1392 | struct lwp_info *lwp; |
fd500816 | 1393 | |
95954743 PA |
1394 | process = find_process_pid (pid); |
1395 | if (process == NULL) | |
1396 | return -1; | |
9d606399 | 1397 | |
f9e39928 PA |
1398 | /* If we're killing a running inferior, make sure it is stopped |
1399 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1400 | stop_all_lwps (0, NULL); |
f9e39928 | 1401 | |
da84f473 | 1402 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1403 | |
54a0b537 | 1404 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1405 | thread in the list, so do so now. */ |
95954743 | 1406 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1407 | |
784867a5 | 1408 | if (lwp == NULL) |
fd500816 | 1409 | { |
784867a5 | 1410 | if (debug_threads) |
d86d4aaf DE |
1411 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1412 | pid); | |
784867a5 JK |
1413 | } |
1414 | else | |
e76126e8 | 1415 | kill_wait_lwp (lwp); |
2d717e4f | 1416 | |
8336d594 | 1417 | the_target->mourn (process); |
f9e39928 PA |
1418 | |
1419 | /* Since we presently can only stop all lwps of all processes, we | |
1420 | need to unstop lwps of other processes. */ | |
7984d532 | 1421 | unstop_all_lwps (0, NULL); |
95954743 | 1422 | return 0; |
0d62e5e8 DJ |
1423 | } |
1424 | ||
9b224c5e PA |
1425 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1426 | signal the thread last stopped for, which we need to deliver to the | |
1427 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1428 | ||
1429 | static int | |
1430 | get_detach_signal (struct thread_info *thread) | |
1431 | { | |
a493e3e2 | 1432 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1433 | int status; |
1434 | struct lwp_info *lp = get_thread_lwp (thread); | |
1435 | ||
1436 | if (lp->status_pending_p) | |
1437 | status = lp->status_pending; | |
1438 | else | |
1439 | { | |
1440 | /* If the thread had been suspended by gdbserver, and it stopped | |
1441 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1442 | want to deliver that SIGSTOP. */ | |
1443 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1444 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1445 | return 0; |
1446 | ||
1447 | /* Otherwise, we may need to deliver the signal we | |
1448 | intercepted. */ | |
1449 | status = lp->last_status; | |
1450 | } | |
1451 | ||
1452 | if (!WIFSTOPPED (status)) | |
1453 | { | |
1454 | if (debug_threads) | |
87ce2a04 | 1455 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1456 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1457 | return 0; |
1458 | } | |
1459 | ||
1460 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1461 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1462 | { |
1463 | if (debug_threads) | |
87ce2a04 DE |
1464 | debug_printf ("GPS: lwp %s had stopped with extended " |
1465 | "status: no pending signal\n", | |
d86d4aaf | 1466 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1467 | return 0; |
1468 | } | |
1469 | ||
2ea28649 | 1470 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1471 | |
1472 | if (program_signals_p && !program_signals[signo]) | |
1473 | { | |
1474 | if (debug_threads) | |
87ce2a04 | 1475 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1476 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1477 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1478 | return 0; |
1479 | } | |
1480 | else if (!program_signals_p | |
1481 | /* If we have no way to know which signals GDB does not | |
1482 | want to have passed to the program, assume | |
1483 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1484 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1485 | { |
1486 | if (debug_threads) | |
87ce2a04 DE |
1487 | debug_printf ("GPS: lwp %s had signal %s, " |
1488 | "but we don't know if we should pass it. " | |
1489 | "Default to not.\n", | |
d86d4aaf | 1490 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1491 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1492 | return 0; |
1493 | } | |
1494 | else | |
1495 | { | |
1496 | if (debug_threads) | |
87ce2a04 | 1497 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1498 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1499 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1500 | |
1501 | return WSTOPSIG (status); | |
1502 | } | |
1503 | } | |
1504 | ||
ced2dffb PA |
1505 | /* Detach from LWP. */ |
1506 | ||
1507 | static void | |
1508 | linux_detach_one_lwp (struct lwp_info *lwp) | |
6ad8ae5c | 1509 | { |
ced2dffb | 1510 | struct thread_info *thread = get_lwp_thread (lwp); |
9b224c5e | 1511 | int sig; |
ced2dffb | 1512 | int lwpid; |
6ad8ae5c | 1513 | |
9b224c5e | 1514 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1515 | if (lwp->stop_expected) |
ae13219e | 1516 | { |
9b224c5e | 1517 | if (debug_threads) |
87ce2a04 | 1518 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1519 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1520 | |
d86d4aaf | 1521 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1522 | lwp->stop_expected = 0; |
ae13219e DJ |
1523 | } |
1524 | ||
9b224c5e PA |
1525 | /* Pass on any pending signal for this thread. */ |
1526 | sig = get_detach_signal (thread); | |
1527 | ||
ced2dffb PA |
1528 | /* Preparing to resume may try to write registers, and fail if the |
1529 | lwp is zombie. If that happens, ignore the error. We'll handle | |
1530 | it below, when detach fails with ESRCH. */ | |
1531 | TRY | |
1532 | { | |
1533 | /* Flush any pending changes to the process's registers. */ | |
1534 | regcache_invalidate_thread (thread); | |
1535 | ||
1536 | /* Finally, let it resume. */ | |
1537 | if (the_low_target.prepare_to_resume != NULL) | |
1538 | the_low_target.prepare_to_resume (lwp); | |
1539 | } | |
1540 | CATCH (ex, RETURN_MASK_ERROR) | |
1541 | { | |
1542 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
1543 | throw_exception (ex); | |
1544 | } | |
1545 | END_CATCH | |
1546 | ||
1547 | lwpid = lwpid_of (thread); | |
1548 | if (ptrace (PTRACE_DETACH, lwpid, (PTRACE_TYPE_ARG3) 0, | |
b8e1b30e | 1549 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
ced2dffb PA |
1550 | { |
1551 | int save_errno = errno; | |
1552 | ||
1553 | /* We know the thread exists, so ESRCH must mean the lwp is | |
1554 | zombie. This can happen if one of the already-detached | |
1555 | threads exits the whole thread group. In that case we're | |
1556 | still attached, and must reap the lwp. */ | |
1557 | if (save_errno == ESRCH) | |
1558 | { | |
1559 | int ret, status; | |
1560 | ||
1561 | ret = my_waitpid (lwpid, &status, __WALL); | |
1562 | if (ret == -1) | |
1563 | { | |
1564 | warning (_("Couldn't reap LWP %d while detaching: %s"), | |
1565 | lwpid, strerror (errno)); | |
1566 | } | |
1567 | else if (!WIFEXITED (status) && !WIFSIGNALED (status)) | |
1568 | { | |
1569 | warning (_("Reaping LWP %d while detaching " | |
1570 | "returned unexpected status 0x%x"), | |
1571 | lwpid, status); | |
1572 | } | |
1573 | } | |
1574 | else | |
1575 | { | |
1576 | error (_("Can't detach %s: %s"), | |
1577 | target_pid_to_str (ptid_of (thread)), | |
1578 | strerror (save_errno)); | |
1579 | } | |
1580 | } | |
1581 | else if (debug_threads) | |
1582 | { | |
1583 | debug_printf ("PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1584 | target_pid_to_str (ptid_of (thread)), | |
1585 | strsignal (sig)); | |
1586 | } | |
bd99dc85 PA |
1587 | |
1588 | delete_lwp (lwp); | |
ced2dffb PA |
1589 | } |
1590 | ||
1591 | /* Callback for find_inferior. Detaches from non-leader threads of a | |
1592 | given process. */ | |
1593 | ||
1594 | static int | |
9c80ecd6 | 1595 | linux_detach_lwp_callback (thread_info *thread, void *args) |
ced2dffb | 1596 | { |
ced2dffb PA |
1597 | struct lwp_info *lwp = get_thread_lwp (thread); |
1598 | int pid = *(int *) args; | |
1599 | int lwpid = lwpid_of (thread); | |
1600 | ||
1601 | /* Skip other processes. */ | |
9c80ecd6 | 1602 | if (thread->id.pid () != pid) |
ced2dffb PA |
1603 | return 0; |
1604 | ||
1605 | /* We don't actually detach from the thread group leader just yet. | |
1606 | If the thread group exits, we must reap the zombie clone lwps | |
1607 | before we're able to reap the leader. */ | |
9c80ecd6 | 1608 | if (thread->id.pid () == lwpid) |
ced2dffb PA |
1609 | return 0; |
1610 | ||
1611 | linux_detach_one_lwp (lwp); | |
95954743 | 1612 | return 0; |
6ad8ae5c DJ |
1613 | } |
1614 | ||
95954743 PA |
1615 | static int |
1616 | linux_detach (int pid) | |
1617 | { | |
1618 | struct process_info *process; | |
ced2dffb | 1619 | struct lwp_info *main_lwp; |
95954743 PA |
1620 | |
1621 | process = find_process_pid (pid); | |
1622 | if (process == NULL) | |
1623 | return -1; | |
1624 | ||
863d01bd PA |
1625 | /* As there's a step over already in progress, let it finish first, |
1626 | otherwise nesting a stabilize_threads operation on top gets real | |
1627 | messy. */ | |
1628 | complete_ongoing_step_over (); | |
1629 | ||
f9e39928 PA |
1630 | /* Stop all threads before detaching. First, ptrace requires that |
1631 | the thread is stopped to sucessfully detach. Second, thread_db | |
1632 | may need to uninstall thread event breakpoints from memory, which | |
1633 | only works with a stopped process anyway. */ | |
7984d532 | 1634 | stop_all_lwps (0, NULL); |
f9e39928 | 1635 | |
ca5c370d | 1636 | #ifdef USE_THREAD_DB |
8336d594 | 1637 | thread_db_detach (process); |
ca5c370d PA |
1638 | #endif |
1639 | ||
fa593d66 PA |
1640 | /* Stabilize threads (move out of jump pads). */ |
1641 | stabilize_threads (); | |
1642 | ||
ced2dffb PA |
1643 | /* Detach from the clone lwps first. If the thread group exits just |
1644 | while we're detaching, we must reap the clone lwps before we're | |
1645 | able to reap the leader. */ | |
1646 | find_inferior (&all_threads, linux_detach_lwp_callback, &pid); | |
1647 | ||
1648 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
1649 | linux_detach_one_lwp (main_lwp); | |
8336d594 PA |
1650 | |
1651 | the_target->mourn (process); | |
f9e39928 PA |
1652 | |
1653 | /* Since we presently can only stop all lwps of all processes, we | |
1654 | need to unstop lwps of other processes. */ | |
7984d532 | 1655 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1656 | return 0; |
1657 | } | |
1658 | ||
1659 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1660 | ||
1661 | static int | |
9c80ecd6 | 1662 | delete_lwp_callback (thread_info *thread, void *proc) |
f9e39928 | 1663 | { |
d86d4aaf | 1664 | struct lwp_info *lwp = get_thread_lwp (thread); |
9a3c8263 | 1665 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1666 | |
d86d4aaf | 1667 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1668 | delete_lwp (lwp); |
1669 | ||
dd6953e1 | 1670 | return 0; |
6ad8ae5c DJ |
1671 | } |
1672 | ||
8336d594 PA |
1673 | static void |
1674 | linux_mourn (struct process_info *process) | |
1675 | { | |
1676 | struct process_info_private *priv; | |
1677 | ||
1678 | #ifdef USE_THREAD_DB | |
1679 | thread_db_mourn (process); | |
1680 | #endif | |
1681 | ||
d86d4aaf | 1682 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1683 | |
8336d594 | 1684 | /* Freeing all private data. */ |
fe978cb0 | 1685 | priv = process->priv; |
04ec7890 SM |
1686 | if (the_low_target.delete_process != NULL) |
1687 | the_low_target.delete_process (priv->arch_private); | |
1688 | else | |
1689 | gdb_assert (priv->arch_private == NULL); | |
8336d594 | 1690 | free (priv); |
fe978cb0 | 1691 | process->priv = NULL; |
505106cd PA |
1692 | |
1693 | remove_process (process); | |
8336d594 PA |
1694 | } |
1695 | ||
444d6139 | 1696 | static void |
95954743 | 1697 | linux_join (int pid) |
444d6139 | 1698 | { |
444d6139 PA |
1699 | int status, ret; |
1700 | ||
1701 | do { | |
95954743 | 1702 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1703 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1704 | break; | |
1705 | } while (ret != -1 || errno != ECHILD); | |
1706 | } | |
1707 | ||
6ad8ae5c | 1708 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1709 | static int |
95954743 | 1710 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1711 | { |
95954743 PA |
1712 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1713 | ||
1714 | /* We assume we always know if a thread exits. If a whole process | |
1715 | exited but we still haven't been able to report it to GDB, we'll | |
1716 | hold on to the last lwp of the dead process. */ | |
1717 | if (lwp != NULL) | |
00db26fa | 1718 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1719 | else |
1720 | return 0; | |
1721 | } | |
1722 | ||
582511be PA |
1723 | /* Return 1 if this lwp still has an interesting status pending. If |
1724 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1725 | false. */ | |
1726 | ||
1727 | static int | |
1728 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1729 | { | |
1730 | struct lwp_info *lp = get_thread_lwp (thread); | |
1731 | ||
1732 | if (!lp->status_pending_p) | |
1733 | return 0; | |
1734 | ||
582511be | 1735 | if (thread->last_resume_kind != resume_stop |
15c66dd6 PA |
1736 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1737 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1738 | { |
1739 | struct thread_info *saved_thread; | |
1740 | CORE_ADDR pc; | |
1741 | int discard = 0; | |
1742 | ||
1743 | gdb_assert (lp->last_status != 0); | |
1744 | ||
1745 | pc = get_pc (lp); | |
1746 | ||
1747 | saved_thread = current_thread; | |
1748 | current_thread = thread; | |
1749 | ||
1750 | if (pc != lp->stop_pc) | |
1751 | { | |
1752 | if (debug_threads) | |
1753 | debug_printf ("PC of %ld changed\n", | |
1754 | lwpid_of (thread)); | |
1755 | discard = 1; | |
1756 | } | |
3e572f71 PA |
1757 | |
1758 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1759 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1760 | && !(*the_low_target.breakpoint_at) (pc)) |
1761 | { | |
1762 | if (debug_threads) | |
1763 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1764 | lwpid_of (thread)); | |
1765 | discard = 1; | |
1766 | } | |
15c66dd6 | 1767 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1768 | && !hardware_breakpoint_inserted_here (pc)) |
1769 | { | |
1770 | if (debug_threads) | |
1771 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1772 | lwpid_of (thread)); | |
1773 | discard = 1; | |
1774 | } | |
3e572f71 | 1775 | #endif |
582511be PA |
1776 | |
1777 | current_thread = saved_thread; | |
1778 | ||
1779 | if (discard) | |
1780 | { | |
1781 | if (debug_threads) | |
1782 | debug_printf ("discarding pending breakpoint status\n"); | |
1783 | lp->status_pending_p = 0; | |
1784 | return 0; | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | return 1; | |
1789 | } | |
1790 | ||
a681f9c9 PA |
1791 | /* Returns true if LWP is resumed from the client's perspective. */ |
1792 | ||
1793 | static int | |
1794 | lwp_resumed (struct lwp_info *lwp) | |
1795 | { | |
1796 | struct thread_info *thread = get_lwp_thread (lwp); | |
1797 | ||
1798 | if (thread->last_resume_kind != resume_stop) | |
1799 | return 1; | |
1800 | ||
1801 | /* Did gdb send us a `vCont;t', but we haven't reported the | |
1802 | corresponding stop to gdb yet? If so, the thread is still | |
1803 | resumed/running from gdb's perspective. */ | |
1804 | if (thread->last_resume_kind == resume_stop | |
1805 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1806 | return 1; | |
1807 | ||
1808 | return 0; | |
1809 | } | |
1810 | ||
6bf5e0ba | 1811 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1812 | static int |
9c80ecd6 | 1813 | status_pending_p_callback (thread_info *thread, void *arg) |
0d62e5e8 | 1814 | { |
582511be | 1815 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1816 | ptid_t ptid = * (ptid_t *) arg; |
1817 | ||
1818 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1819 | or a specific LWP. */ |
1820 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1821 | return 0; |
0d62e5e8 | 1822 | |
a681f9c9 PA |
1823 | if (!lwp_resumed (lp)) |
1824 | return 0; | |
1825 | ||
582511be PA |
1826 | if (lp->status_pending_p |
1827 | && !thread_still_has_status_pending_p (thread)) | |
1828 | { | |
1829 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1830 | return 0; | |
1831 | } | |
0d62e5e8 | 1832 | |
582511be | 1833 | return lp->status_pending_p; |
0d62e5e8 DJ |
1834 | } |
1835 | ||
95954743 | 1836 | static int |
9c80ecd6 | 1837 | same_lwp (thread_info *thread, void *data) |
95954743 PA |
1838 | { |
1839 | ptid_t ptid = *(ptid_t *) data; | |
1840 | int lwp; | |
1841 | ||
1842 | if (ptid_get_lwp (ptid) != 0) | |
1843 | lwp = ptid_get_lwp (ptid); | |
1844 | else | |
1845 | lwp = ptid_get_pid (ptid); | |
1846 | ||
9c80ecd6 | 1847 | if (thread->id.lwp () == lwp) |
95954743 PA |
1848 | return 1; |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | struct lwp_info * | |
1854 | find_lwp_pid (ptid_t ptid) | |
1855 | { | |
9c80ecd6 | 1856 | thread_info *thread = find_inferior (&all_threads, same_lwp, &ptid); |
d86d4aaf DE |
1857 | |
1858 | if (thread == NULL) | |
1859 | return NULL; | |
1860 | ||
9c80ecd6 | 1861 | return get_thread_lwp (thread); |
95954743 PA |
1862 | } |
1863 | ||
fa96cb38 | 1864 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1865 | |
fa96cb38 PA |
1866 | static int |
1867 | num_lwps (int pid) | |
1868 | { | |
fa96cb38 | 1869 | int count = 0; |
0d62e5e8 | 1870 | |
4d3bb80e SM |
1871 | for_each_thread (pid, [&] (thread_info *thread) |
1872 | { | |
9c80ecd6 | 1873 | count++; |
4d3bb80e | 1874 | }); |
3aee8918 | 1875 | |
fa96cb38 PA |
1876 | return count; |
1877 | } | |
d61ddec4 | 1878 | |
6d4ee8c6 GB |
1879 | /* See nat/linux-nat.h. */ |
1880 | ||
1881 | struct lwp_info * | |
1882 | iterate_over_lwps (ptid_t filter, | |
1883 | iterate_over_lwps_ftype callback, | |
1884 | void *data) | |
1885 | { | |
6d1e5673 SM |
1886 | thread_info *thread = find_thread (filter, [&] (thread_info *thread) |
1887 | { | |
1888 | lwp_info *lwp = get_thread_lwp (thread); | |
1889 | ||
1890 | return callback (lwp, data); | |
1891 | }); | |
6d4ee8c6 | 1892 | |
9c80ecd6 | 1893 | if (thread == NULL) |
6d4ee8c6 GB |
1894 | return NULL; |
1895 | ||
9c80ecd6 | 1896 | return get_thread_lwp (thread); |
6d4ee8c6 GB |
1897 | } |
1898 | ||
fa96cb38 PA |
1899 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1900 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1901 | |
fa96cb38 PA |
1902 | static void |
1903 | check_zombie_leaders (void) | |
1904 | { | |
9179355e SM |
1905 | for_each_process ([] (process_info *proc) { |
1906 | pid_t leader_pid = pid_of (proc); | |
1907 | struct lwp_info *leader_lp; | |
1908 | ||
1909 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); | |
1910 | ||
1911 | if (debug_threads) | |
1912 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1913 | "num_lwps=%d, zombie=%d\n", | |
1914 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1915 | linux_proc_pid_is_zombie (leader_pid)); | |
1916 | ||
1917 | if (leader_lp != NULL && !leader_lp->stopped | |
1918 | /* Check if there are other threads in the group, as we may | |
1919 | have raced with the inferior simply exiting. */ | |
1920 | && !last_thread_of_process_p (leader_pid) | |
1921 | && linux_proc_pid_is_zombie (leader_pid)) | |
1922 | { | |
1923 | /* A leader zombie can mean one of two things: | |
1924 | ||
1925 | - It exited, and there's an exit status pending | |
1926 | available, or only the leader exited (not the whole | |
1927 | program). In the latter case, we can't waitpid the | |
1928 | leader's exit status until all other threads are gone. | |
1929 | ||
1930 | - There are 3 or more threads in the group, and a thread | |
1931 | other than the leader exec'd. On an exec, the Linux | |
1932 | kernel destroys all other threads (except the execing | |
1933 | one) in the thread group, and resets the execing thread's | |
1934 | tid to the tgid. No exit notification is sent for the | |
1935 | execing thread -- from the ptracer's perspective, it | |
1936 | appears as though the execing thread just vanishes. | |
1937 | Until we reap all other threads except the leader and the | |
1938 | execing thread, the leader will be zombie, and the | |
1939 | execing thread will be in `D (disc sleep)'. As soon as | |
1940 | all other threads are reaped, the execing thread changes | |
1941 | it's tid to the tgid, and the previous (zombie) leader | |
1942 | vanishes, giving place to the "new" leader. We could try | |
1943 | distinguishing the exit and exec cases, by waiting once | |
1944 | more, and seeing if something comes out, but it doesn't | |
1945 | sound useful. The previous leader _does_ go away, and | |
1946 | we'll re-add the new one once we see the exec event | |
1947 | (which is just the same as what would happen if the | |
1948 | previous leader did exit voluntarily before some other | |
1949 | thread execs). */ | |
1950 | ||
1951 | if (debug_threads) | |
1952 | debug_printf ("CZL: Thread group leader %d zombie " | |
1953 | "(it exited, or another thread execd).\n", | |
1954 | leader_pid); | |
1955 | ||
1956 | delete_lwp (leader_lp); | |
1957 | } | |
1958 | }); | |
fa96cb38 | 1959 | } |
c3adc08c | 1960 | |
fa96cb38 PA |
1961 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1962 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1963 | |
fa96cb38 | 1964 | static int |
9c80ecd6 | 1965 | not_stopped_callback (thread_info *thread, void *arg) |
fa96cb38 | 1966 | { |
fa96cb38 PA |
1967 | struct lwp_info *lwp; |
1968 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1969 | |
9c80ecd6 | 1970 | if (!ptid_match (ptid_of (thread), filter)) |
fa96cb38 | 1971 | return 0; |
bd99dc85 | 1972 | |
9c80ecd6 | 1973 | lwp = get_thread_lwp (thread); |
fa96cb38 PA |
1974 | if (!lwp->stopped) |
1975 | return 1; | |
1976 | ||
1977 | return 0; | |
0d62e5e8 | 1978 | } |
611cb4a5 | 1979 | |
863d01bd PA |
1980 | /* Increment LWP's suspend count. */ |
1981 | ||
1982 | static void | |
1983 | lwp_suspended_inc (struct lwp_info *lwp) | |
1984 | { | |
1985 | lwp->suspended++; | |
1986 | ||
1987 | if (debug_threads && lwp->suspended > 4) | |
1988 | { | |
1989 | struct thread_info *thread = get_lwp_thread (lwp); | |
1990 | ||
1991 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1992 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1993 | } | |
1994 | } | |
1995 | ||
1996 | /* Decrement LWP's suspend count. */ | |
1997 | ||
1998 | static void | |
1999 | lwp_suspended_decr (struct lwp_info *lwp) | |
2000 | { | |
2001 | lwp->suspended--; | |
2002 | ||
2003 | if (lwp->suspended < 0) | |
2004 | { | |
2005 | struct thread_info *thread = get_lwp_thread (lwp); | |
2006 | ||
2007 | internal_error (__FILE__, __LINE__, | |
2008 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
2009 | lwp->suspended); | |
2010 | } | |
2011 | } | |
2012 | ||
219f2f23 PA |
2013 | /* This function should only be called if the LWP got a SIGTRAP. |
2014 | ||
2015 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
2016 | event was handled, 0 otherwise. */ | |
2017 | ||
2018 | static int | |
2019 | handle_tracepoints (struct lwp_info *lwp) | |
2020 | { | |
2021 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
2022 | int tpoint_related_event = 0; | |
2023 | ||
582511be PA |
2024 | gdb_assert (lwp->suspended == 0); |
2025 | ||
7984d532 PA |
2026 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
2027 | uninsert tracepoints. To do this, we temporarily pause all | |
2028 | threads, unpatch away, and then unpause threads. We need to make | |
2029 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 2030 | lwp_suspended_inc (lwp); |
7984d532 | 2031 | |
219f2f23 PA |
2032 | /* And we need to be sure that any all-threads-stopping doesn't try |
2033 | to move threads out of the jump pads, as it could deadlock the | |
2034 | inferior (LWP could be in the jump pad, maybe even holding the | |
2035 | lock.) */ | |
2036 | ||
2037 | /* Do any necessary step collect actions. */ | |
2038 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
2039 | ||
fa593d66 PA |
2040 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
2041 | ||
219f2f23 PA |
2042 | /* See if we just hit a tracepoint and do its main collect |
2043 | actions. */ | |
2044 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
2045 | ||
863d01bd | 2046 | lwp_suspended_decr (lwp); |
7984d532 PA |
2047 | |
2048 | gdb_assert (lwp->suspended == 0); | |
229d26fc SM |
2049 | gdb_assert (!stabilizing_threads |
2050 | || (lwp->collecting_fast_tracepoint | |
2051 | != fast_tpoint_collect_result::not_collecting)); | |
7984d532 | 2052 | |
219f2f23 PA |
2053 | if (tpoint_related_event) |
2054 | { | |
2055 | if (debug_threads) | |
87ce2a04 | 2056 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
2057 | return 1; |
2058 | } | |
2059 | ||
2060 | return 0; | |
2061 | } | |
2062 | ||
229d26fc SM |
2063 | /* Convenience wrapper. Returns information about LWP's fast tracepoint |
2064 | collection status. */ | |
fa593d66 | 2065 | |
229d26fc | 2066 | static fast_tpoint_collect_result |
fa593d66 PA |
2067 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, |
2068 | struct fast_tpoint_collect_status *status) | |
2069 | { | |
2070 | CORE_ADDR thread_area; | |
d86d4aaf | 2071 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2072 | |
2073 | if (the_low_target.get_thread_area == NULL) | |
229d26fc | 2074 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2075 | |
2076 | /* Get the thread area address. This is used to recognize which | |
2077 | thread is which when tracing with the in-process agent library. | |
2078 | We don't read anything from the address, and treat it as opaque; | |
2079 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 2080 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
229d26fc | 2081 | return fast_tpoint_collect_result::not_collecting; |
fa593d66 PA |
2082 | |
2083 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
2084 | } | |
2085 | ||
2086 | /* The reason we resume in the caller, is because we want to be able | |
2087 | to pass lwp->status_pending as WSTAT, and we need to clear | |
2088 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
2089 | refuses to resume. */ | |
2090 | ||
2091 | static int | |
2092 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
2093 | { | |
0bfdf32f | 2094 | struct thread_info *saved_thread; |
fa593d66 | 2095 | |
0bfdf32f GB |
2096 | saved_thread = current_thread; |
2097 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
2098 | |
2099 | if ((wstat == NULL | |
2100 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
2101 | && supports_fast_tracepoints () | |
58b4daa5 | 2102 | && agent_loaded_p ()) |
fa593d66 PA |
2103 | { |
2104 | struct fast_tpoint_collect_status status; | |
fa593d66 PA |
2105 | |
2106 | if (debug_threads) | |
87ce2a04 DE |
2107 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2108 | "jump pad.\n", | |
0bfdf32f | 2109 | lwpid_of (current_thread)); |
fa593d66 | 2110 | |
229d26fc SM |
2111 | fast_tpoint_collect_result r |
2112 | = linux_fast_tracepoint_collecting (lwp, &status); | |
fa593d66 PA |
2113 | |
2114 | if (wstat == NULL | |
2115 | || (WSTOPSIG (*wstat) != SIGILL | |
2116 | && WSTOPSIG (*wstat) != SIGFPE | |
2117 | && WSTOPSIG (*wstat) != SIGSEGV | |
2118 | && WSTOPSIG (*wstat) != SIGBUS)) | |
2119 | { | |
2120 | lwp->collecting_fast_tracepoint = r; | |
2121 | ||
229d26fc | 2122 | if (r != fast_tpoint_collect_result::not_collecting) |
fa593d66 | 2123 | { |
229d26fc SM |
2124 | if (r == fast_tpoint_collect_result::before_insn |
2125 | && lwp->exit_jump_pad_bkpt == NULL) | |
fa593d66 PA |
2126 | { |
2127 | /* Haven't executed the original instruction yet. | |
2128 | Set breakpoint there, and wait till it's hit, | |
2129 | then single-step until exiting the jump pad. */ | |
2130 | lwp->exit_jump_pad_bkpt | |
2131 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
2132 | } | |
2133 | ||
2134 | if (debug_threads) | |
87ce2a04 DE |
2135 | debug_printf ("Checking whether LWP %ld needs to move out of " |
2136 | "the jump pad...it does\n", | |
0bfdf32f GB |
2137 | lwpid_of (current_thread)); |
2138 | current_thread = saved_thread; | |
fa593d66 PA |
2139 | |
2140 | return 1; | |
2141 | } | |
2142 | } | |
2143 | else | |
2144 | { | |
2145 | /* If we get a synchronous signal while collecting, *and* | |
2146 | while executing the (relocated) original instruction, | |
2147 | reset the PC to point at the tpoint address, before | |
2148 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
2149 | report the signal to GDB, and pray for the best. */ | |
2150 | ||
229d26fc SM |
2151 | lwp->collecting_fast_tracepoint |
2152 | = fast_tpoint_collect_result::not_collecting; | |
fa593d66 | 2153 | |
229d26fc | 2154 | if (r != fast_tpoint_collect_result::not_collecting |
fa593d66 PA |
2155 | && (status.adjusted_insn_addr <= lwp->stop_pc |
2156 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
2157 | { | |
2158 | siginfo_t info; | |
2159 | struct regcache *regcache; | |
2160 | ||
2161 | /* The si_addr on a few signals references the address | |
2162 | of the faulting instruction. Adjust that as | |
2163 | well. */ | |
2164 | if ((WSTOPSIG (*wstat) == SIGILL | |
2165 | || WSTOPSIG (*wstat) == SIGFPE | |
2166 | || WSTOPSIG (*wstat) == SIGBUS | |
2167 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 2168 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2169 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
2170 | /* Final check just to make sure we don't clobber |
2171 | the siginfo of non-kernel-sent signals. */ | |
2172 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
2173 | { | |
2174 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 2175 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2176 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
2177 | } |
2178 | ||
0bfdf32f | 2179 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
2180 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
2181 | lwp->stop_pc = status.tpoint_addr; | |
2182 | ||
2183 | /* Cancel any fast tracepoint lock this thread was | |
2184 | holding. */ | |
2185 | force_unlock_trace_buffer (); | |
2186 | } | |
2187 | ||
2188 | if (lwp->exit_jump_pad_bkpt != NULL) | |
2189 | { | |
2190 | if (debug_threads) | |
87ce2a04 DE |
2191 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
2192 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2193 | |
2194 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
2195 | |
2196 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
2197 | lwp->exit_jump_pad_bkpt = NULL; | |
2198 | ||
2199 | unstop_all_lwps (1, lwp); | |
2200 | ||
2201 | gdb_assert (lwp->suspended >= 0); | |
2202 | } | |
2203 | } | |
2204 | } | |
2205 | ||
2206 | if (debug_threads) | |
87ce2a04 DE |
2207 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
2208 | "jump pad...no\n", | |
0bfdf32f | 2209 | lwpid_of (current_thread)); |
0cccb683 | 2210 | |
0bfdf32f | 2211 | current_thread = saved_thread; |
fa593d66 PA |
2212 | return 0; |
2213 | } | |
2214 | ||
2215 | /* Enqueue one signal in the "signals to report later when out of the | |
2216 | jump pad" list. */ | |
2217 | ||
2218 | static void | |
2219 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2220 | { | |
2221 | struct pending_signals *p_sig; | |
d86d4aaf | 2222 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2223 | |
2224 | if (debug_threads) | |
87ce2a04 | 2225 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2226 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2227 | |
2228 | if (debug_threads) | |
2229 | { | |
2230 | struct pending_signals *sig; | |
2231 | ||
2232 | for (sig = lwp->pending_signals_to_report; | |
2233 | sig != NULL; | |
2234 | sig = sig->prev) | |
87ce2a04 DE |
2235 | debug_printf (" Already queued %d\n", |
2236 | sig->signal); | |
fa593d66 | 2237 | |
87ce2a04 | 2238 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2239 | } |
2240 | ||
1a981360 PA |
2241 | /* Don't enqueue non-RT signals if they are already in the deferred |
2242 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2243 | twice) */ | |
2244 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2245 | { | |
2246 | struct pending_signals *sig; | |
2247 | ||
2248 | for (sig = lwp->pending_signals_to_report; | |
2249 | sig != NULL; | |
2250 | sig = sig->prev) | |
2251 | { | |
2252 | if (sig->signal == WSTOPSIG (*wstat)) | |
2253 | { | |
2254 | if (debug_threads) | |
87ce2a04 DE |
2255 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2256 | " for LWP %ld\n", | |
2257 | sig->signal, | |
d86d4aaf | 2258 | lwpid_of (thread)); |
1a981360 PA |
2259 | return; |
2260 | } | |
2261 | } | |
2262 | } | |
2263 | ||
8d749320 | 2264 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2265 | p_sig->prev = lwp->pending_signals_to_report; |
2266 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2267 | |
d86d4aaf | 2268 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2269 | &p_sig->info); |
fa593d66 PA |
2270 | |
2271 | lwp->pending_signals_to_report = p_sig; | |
2272 | } | |
2273 | ||
2274 | /* Dequeue one signal from the "signals to report later when out of | |
2275 | the jump pad" list. */ | |
2276 | ||
2277 | static int | |
2278 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2279 | { | |
d86d4aaf DE |
2280 | struct thread_info *thread = get_lwp_thread (lwp); |
2281 | ||
fa593d66 PA |
2282 | if (lwp->pending_signals_to_report != NULL) |
2283 | { | |
2284 | struct pending_signals **p_sig; | |
2285 | ||
2286 | p_sig = &lwp->pending_signals_to_report; | |
2287 | while ((*p_sig)->prev != NULL) | |
2288 | p_sig = &(*p_sig)->prev; | |
2289 | ||
2290 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2291 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2292 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2293 | &(*p_sig)->info); |
fa593d66 PA |
2294 | free (*p_sig); |
2295 | *p_sig = NULL; | |
2296 | ||
2297 | if (debug_threads) | |
87ce2a04 | 2298 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2299 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2300 | |
2301 | if (debug_threads) | |
2302 | { | |
2303 | struct pending_signals *sig; | |
2304 | ||
2305 | for (sig = lwp->pending_signals_to_report; | |
2306 | sig != NULL; | |
2307 | sig = sig->prev) | |
87ce2a04 DE |
2308 | debug_printf (" Still queued %d\n", |
2309 | sig->signal); | |
fa593d66 | 2310 | |
87ce2a04 | 2311 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2312 | } |
2313 | ||
2314 | return 1; | |
2315 | } | |
2316 | ||
2317 | return 0; | |
2318 | } | |
2319 | ||
582511be PA |
2320 | /* Fetch the possibly triggered data watchpoint info and store it in |
2321 | CHILD. | |
d50171e4 | 2322 | |
582511be PA |
2323 | On some archs, like x86, that use debug registers to set |
2324 | watchpoints, it's possible that the way to know which watched | |
2325 | address trapped, is to check the register that is used to select | |
2326 | which address to watch. Problem is, between setting the watchpoint | |
2327 | and reading back which data address trapped, the user may change | |
2328 | the set of watchpoints, and, as a consequence, GDB changes the | |
2329 | debug registers in the inferior. To avoid reading back a stale | |
2330 | stopped-data-address when that happens, we cache in LP the fact | |
2331 | that a watchpoint trapped, and the corresponding data address, as | |
2332 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2333 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2334 | |
582511be PA |
2335 | static int |
2336 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2337 | { | |
2338 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2339 | { |
582511be | 2340 | struct thread_info *saved_thread; |
d50171e4 | 2341 | |
582511be PA |
2342 | saved_thread = current_thread; |
2343 | current_thread = get_lwp_thread (child); | |
2344 | ||
2345 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2346 | { |
15c66dd6 | 2347 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2348 | |
2349 | if (the_low_target.stopped_data_address != NULL) | |
2350 | child->stopped_data_address | |
2351 | = the_low_target.stopped_data_address (); | |
2352 | else | |
2353 | child->stopped_data_address = 0; | |
d50171e4 PA |
2354 | } |
2355 | ||
0bfdf32f | 2356 | current_thread = saved_thread; |
d50171e4 PA |
2357 | } |
2358 | ||
15c66dd6 | 2359 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2360 | } |
2361 | ||
de0d863e DB |
2362 | /* Return the ptrace options that we want to try to enable. */ |
2363 | ||
2364 | static int | |
2365 | linux_low_ptrace_options (int attached) | |
2366 | { | |
2367 | int options = 0; | |
2368 | ||
2369 | if (!attached) | |
2370 | options |= PTRACE_O_EXITKILL; | |
2371 | ||
2372 | if (report_fork_events) | |
2373 | options |= PTRACE_O_TRACEFORK; | |
2374 | ||
c269dbdb DB |
2375 | if (report_vfork_events) |
2376 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2377 | ||
94585166 DB |
2378 | if (report_exec_events) |
2379 | options |= PTRACE_O_TRACEEXEC; | |
2380 | ||
82075af2 JS |
2381 | options |= PTRACE_O_TRACESYSGOOD; |
2382 | ||
de0d863e DB |
2383 | return options; |
2384 | } | |
2385 | ||
fa96cb38 PA |
2386 | /* Do low-level handling of the event, and check if we should go on |
2387 | and pass it to caller code. Return the affected lwp if we are, or | |
2388 | NULL otherwise. */ | |
2389 | ||
2390 | static struct lwp_info * | |
582511be | 2391 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2392 | { |
2393 | struct lwp_info *child; | |
2394 | struct thread_info *thread; | |
582511be | 2395 | int have_stop_pc = 0; |
fa96cb38 PA |
2396 | |
2397 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2398 | ||
94585166 DB |
2399 | /* Check for stop events reported by a process we didn't already |
2400 | know about - anything not already in our LWP list. | |
2401 | ||
2402 | If we're expecting to receive stopped processes after | |
2403 | fork, vfork, and clone events, then we'll just add the | |
2404 | new one to our list and go back to waiting for the event | |
2405 | to be reported - the stopped process might be returned | |
2406 | from waitpid before or after the event is. | |
2407 | ||
2408 | But note the case of a non-leader thread exec'ing after the | |
2409 | leader having exited, and gone from our lists (because | |
2410 | check_zombie_leaders deleted it). The non-leader thread | |
2411 | changes its tid to the tgid. */ | |
2412 | ||
2413 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2414 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2415 | { | |
2416 | ptid_t child_ptid; | |
2417 | ||
2418 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2419 | if (debug_threads) | |
2420 | { | |
2421 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2422 | "after exec.\n", lwpid); | |
2423 | } | |
2424 | ||
2425 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2426 | child = add_lwp (child_ptid); | |
2427 | child->stopped = 1; | |
2428 | current_thread = child->thread; | |
2429 | } | |
2430 | ||
fa96cb38 PA |
2431 | /* If we didn't find a process, one of two things presumably happened: |
2432 | - A process we started and then detached from has exited. Ignore it. | |
2433 | - A process we are controlling has forked and the new child's stop | |
2434 | was reported to us by the kernel. Save its PID. */ | |
2435 | if (child == NULL && WIFSTOPPED (wstat)) | |
2436 | { | |
2437 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2438 | return NULL; | |
2439 | } | |
2440 | else if (child == NULL) | |
2441 | return NULL; | |
2442 | ||
2443 | thread = get_lwp_thread (child); | |
2444 | ||
2445 | child->stopped = 1; | |
2446 | ||
2447 | child->last_status = wstat; | |
2448 | ||
582511be PA |
2449 | /* Check if the thread has exited. */ |
2450 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2451 | { | |
2452 | if (debug_threads) | |
2453 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
f50bf8e5 YQ |
2454 | |
2455 | if (finish_step_over (child)) | |
2456 | { | |
2457 | /* Unsuspend all other LWPs, and set them back running again. */ | |
2458 | unsuspend_all_lwps (child); | |
2459 | } | |
2460 | ||
65706a29 PA |
2461 | /* If there is at least one more LWP, then the exit signal was |
2462 | not the end of the debugged application and should be | |
2463 | ignored, unless GDB wants to hear about thread exits. */ | |
2464 | if (report_thread_events | |
2465 | || last_thread_of_process_p (pid_of (thread))) | |
582511be | 2466 | { |
65706a29 PA |
2467 | /* Since events are serialized to GDB core, and we can't |
2468 | report this one right now. Leave the status pending for | |
2469 | the next time we're able to report it. */ | |
2470 | mark_lwp_dead (child, wstat); | |
2471 | return child; | |
582511be PA |
2472 | } |
2473 | else | |
2474 | { | |
65706a29 PA |
2475 | delete_lwp (child); |
2476 | return NULL; | |
582511be PA |
2477 | } |
2478 | } | |
2479 | ||
2480 | gdb_assert (WIFSTOPPED (wstat)); | |
2481 | ||
fa96cb38 PA |
2482 | if (WIFSTOPPED (wstat)) |
2483 | { | |
2484 | struct process_info *proc; | |
2485 | ||
c06cbd92 | 2486 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2487 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2488 | if (proc->tdesc == NULL) |
fa96cb38 | 2489 | { |
c06cbd92 YQ |
2490 | if (proc->attached) |
2491 | { | |
c06cbd92 YQ |
2492 | /* This needs to happen after we have attached to the |
2493 | inferior and it is stopped for the first time, but | |
2494 | before we access any inferior registers. */ | |
94585166 | 2495 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2496 | } |
2497 | else | |
2498 | { | |
2499 | /* The process is started, but GDBserver will do | |
2500 | architecture-specific setup after the program stops at | |
2501 | the first instruction. */ | |
2502 | child->status_pending_p = 1; | |
2503 | child->status_pending = wstat; | |
2504 | return child; | |
2505 | } | |
fa96cb38 PA |
2506 | } |
2507 | } | |
2508 | ||
fa96cb38 PA |
2509 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2510 | { | |
beed38b8 | 2511 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2512 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2513 | |
de0d863e | 2514 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2515 | child->must_set_ptrace_flags = 0; |
2516 | } | |
2517 | ||
82075af2 JS |
2518 | /* Always update syscall_state, even if it will be filtered later. */ |
2519 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP) | |
2520 | { | |
2521 | child->syscall_state | |
2522 | = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2523 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2524 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2525 | } | |
2526 | else | |
2527 | { | |
2528 | /* Almost all other ptrace-stops are known to be outside of system | |
2529 | calls, with further exceptions in handle_extended_wait. */ | |
2530 | child->syscall_state = TARGET_WAITKIND_IGNORE; | |
2531 | } | |
2532 | ||
e7ad2f14 PA |
2533 | /* Be careful to not overwrite stop_pc until save_stop_reason is |
2534 | called. */ | |
fa96cb38 | 2535 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2536 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2537 | { |
582511be | 2538 | child->stop_pc = get_pc (child); |
94585166 | 2539 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2540 | { |
2541 | /* The event has been handled, so just return without | |
2542 | reporting it. */ | |
2543 | return NULL; | |
2544 | } | |
fa96cb38 PA |
2545 | } |
2546 | ||
80aea927 | 2547 | if (linux_wstatus_maybe_breakpoint (wstat)) |
582511be | 2548 | { |
e7ad2f14 | 2549 | if (save_stop_reason (child)) |
582511be PA |
2550 | have_stop_pc = 1; |
2551 | } | |
2552 | ||
2553 | if (!have_stop_pc) | |
2554 | child->stop_pc = get_pc (child); | |
2555 | ||
fa96cb38 PA |
2556 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2557 | && child->stop_expected) | |
2558 | { | |
2559 | if (debug_threads) | |
2560 | debug_printf ("Expected stop.\n"); | |
2561 | child->stop_expected = 0; | |
2562 | ||
2563 | if (thread->last_resume_kind == resume_stop) | |
2564 | { | |
2565 | /* We want to report the stop to the core. Treat the | |
2566 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2567 | if (debug_threads) |
2568 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2569 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2570 | } |
2571 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2572 | { | |
2573 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2574 | pending. */ |
2bf6fb9d PA |
2575 | if (debug_threads) |
2576 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2577 | "while stopping threads.\n", | |
2578 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2579 | return NULL; |
2580 | } | |
2581 | else | |
2582 | { | |
2bf6fb9d PA |
2583 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2584 | if (debug_threads) | |
2585 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2586 | child->stepping ? "step" : "continue", | |
2587 | target_pid_to_str (ptid_of (thread))); | |
2588 | ||
fa96cb38 PA |
2589 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2590 | return NULL; | |
2591 | } | |
2592 | } | |
2593 | ||
582511be PA |
2594 | child->status_pending_p = 1; |
2595 | child->status_pending = wstat; | |
fa96cb38 PA |
2596 | return child; |
2597 | } | |
2598 | ||
f79b145d YQ |
2599 | /* Return true if THREAD is doing hardware single step. */ |
2600 | ||
2601 | static int | |
2602 | maybe_hw_step (struct thread_info *thread) | |
2603 | { | |
2604 | if (can_hardware_single_step ()) | |
2605 | return 1; | |
2606 | else | |
2607 | { | |
3b9a79ef | 2608 | /* GDBserver must insert single-step breakpoint for software |
f79b145d | 2609 | single step. */ |
3b9a79ef | 2610 | gdb_assert (has_single_step_breakpoints (thread)); |
f79b145d YQ |
2611 | return 0; |
2612 | } | |
2613 | } | |
2614 | ||
20ba1ce6 PA |
2615 | /* Resume LWPs that are currently stopped without any pending status |
2616 | to report, but are resumed from the core's perspective. */ | |
2617 | ||
2618 | static void | |
9c80ecd6 | 2619 | resume_stopped_resumed_lwps (thread_info *thread) |
20ba1ce6 | 2620 | { |
20ba1ce6 PA |
2621 | struct lwp_info *lp = get_thread_lwp (thread); |
2622 | ||
2623 | if (lp->stopped | |
863d01bd | 2624 | && !lp->suspended |
20ba1ce6 | 2625 | && !lp->status_pending_p |
20ba1ce6 PA |
2626 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) |
2627 | { | |
8901d193 YQ |
2628 | int step = 0; |
2629 | ||
2630 | if (thread->last_resume_kind == resume_step) | |
2631 | step = maybe_hw_step (thread); | |
20ba1ce6 PA |
2632 | |
2633 | if (debug_threads) | |
2634 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2635 | target_pid_to_str (ptid_of (thread)), | |
2636 | paddress (lp->stop_pc), | |
2637 | step); | |
2638 | ||
2639 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2640 | } | |
2641 | } | |
2642 | ||
fa96cb38 PA |
2643 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2644 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2645 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2646 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2647 | the stop status through the status pointer WSTAT. OPTIONS is | |
2648 | passed to the waitpid call. Return 0 if no event was found and | |
2649 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2650 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2651 | |
0d62e5e8 | 2652 | static int |
fa96cb38 PA |
2653 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2654 | int *wstatp, int options) | |
0d62e5e8 | 2655 | { |
d86d4aaf | 2656 | struct thread_info *event_thread; |
d50171e4 | 2657 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2658 | sigset_t block_mask, prev_mask; |
d50171e4 | 2659 | |
fa96cb38 | 2660 | retry: |
d86d4aaf DE |
2661 | /* N.B. event_thread points to the thread_info struct that contains |
2662 | event_child. Keep them in sync. */ | |
2663 | event_thread = NULL; | |
d50171e4 PA |
2664 | event_child = NULL; |
2665 | requested_child = NULL; | |
0d62e5e8 | 2666 | |
95954743 | 2667 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2668 | |
fa96cb38 | 2669 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2670 | { |
d86d4aaf | 2671 | event_thread = (struct thread_info *) |
89342618 YQ |
2672 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2673 | &filter_ptid); | |
d86d4aaf DE |
2674 | if (event_thread != NULL) |
2675 | event_child = get_thread_lwp (event_thread); | |
2676 | if (debug_threads && event_thread) | |
2677 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2678 | } |
fa96cb38 | 2679 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2680 | { |
fa96cb38 | 2681 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2682 | |
bde24c0a | 2683 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 | 2684 | && requested_child->status_pending_p |
229d26fc SM |
2685 | && (requested_child->collecting_fast_tracepoint |
2686 | != fast_tpoint_collect_result::not_collecting)) | |
fa593d66 PA |
2687 | { |
2688 | enqueue_one_deferred_signal (requested_child, | |
2689 | &requested_child->status_pending); | |
2690 | requested_child->status_pending_p = 0; | |
2691 | requested_child->status_pending = 0; | |
2692 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2693 | } | |
2694 | ||
2695 | if (requested_child->suspended | |
2696 | && requested_child->status_pending_p) | |
38e08fca GB |
2697 | { |
2698 | internal_error (__FILE__, __LINE__, | |
2699 | "requesting an event out of a" | |
2700 | " suspended child?"); | |
2701 | } | |
fa593d66 | 2702 | |
d50171e4 | 2703 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2704 | { |
2705 | event_child = requested_child; | |
2706 | event_thread = get_lwp_thread (event_child); | |
2707 | } | |
0d62e5e8 | 2708 | } |
611cb4a5 | 2709 | |
0d62e5e8 DJ |
2710 | if (event_child != NULL) |
2711 | { | |
bd99dc85 | 2712 | if (debug_threads) |
87ce2a04 | 2713 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2714 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2715 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2716 | event_child->status_pending_p = 0; |
2717 | event_child->status_pending = 0; | |
0bfdf32f | 2718 | current_thread = event_thread; |
d86d4aaf | 2719 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2720 | } |
2721 | ||
fa96cb38 PA |
2722 | /* But if we don't find a pending event, we'll have to wait. |
2723 | ||
2724 | We only enter this loop if no process has a pending wait status. | |
2725 | Thus any action taken in response to a wait status inside this | |
2726 | loop is responding as soon as we detect the status, not after any | |
2727 | pending events. */ | |
d8301ad1 | 2728 | |
fa96cb38 PA |
2729 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2730 | all signals while here. */ | |
2731 | sigfillset (&block_mask); | |
2732 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2733 | ||
582511be PA |
2734 | /* Always pull all events out of the kernel. We'll randomly select |
2735 | an event LWP out of all that have events, to prevent | |
2736 | starvation. */ | |
fa96cb38 | 2737 | while (event_child == NULL) |
0d62e5e8 | 2738 | { |
fa96cb38 | 2739 | pid_t ret = 0; |
0d62e5e8 | 2740 | |
fa96cb38 PA |
2741 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2742 | quirks: | |
0d62e5e8 | 2743 | |
fa96cb38 PA |
2744 | - If the thread group leader exits while other threads in the |
2745 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2746 | waitpid won't return an exit status until the other threads | |
2747 | in the group are reaped. | |
611cb4a5 | 2748 | |
fa96cb38 PA |
2749 | - When a non-leader thread execs, that thread just vanishes |
2750 | without reporting an exit (so we'd hang if we waited for it | |
2751 | explicitly in that case). The exec event is reported to | |
94585166 | 2752 | the TGID pid. */ |
fa96cb38 PA |
2753 | errno = 0; |
2754 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2755 | |
fa96cb38 PA |
2756 | if (debug_threads) |
2757 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2758 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2759 | |
fa96cb38 | 2760 | if (ret > 0) |
0d62e5e8 | 2761 | { |
89be2091 | 2762 | if (debug_threads) |
bd99dc85 | 2763 | { |
fa96cb38 PA |
2764 | debug_printf ("LLW: waitpid %ld received %s\n", |
2765 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2766 | } |
89be2091 | 2767 | |
582511be PA |
2768 | /* Filter all events. IOW, leave all events pending. We'll |
2769 | randomly select an event LWP out of all that have events | |
2770 | below. */ | |
2771 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2772 | /* Retry until nothing comes out of waitpid. A single |
2773 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2774 | continue; |
2775 | } | |
2776 | ||
20ba1ce6 PA |
2777 | /* Now that we've pulled all events out of the kernel, resume |
2778 | LWPs that don't have an interesting event to report. */ | |
2779 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2780 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2781 | ||
2782 | /* ... and find an LWP with a status to report to the core, if | |
2783 | any. */ | |
582511be | 2784 | event_thread = (struct thread_info *) |
89342618 YQ |
2785 | find_inferior_in_random (&all_threads, status_pending_p_callback, |
2786 | &filter_ptid); | |
582511be PA |
2787 | if (event_thread != NULL) |
2788 | { | |
2789 | event_child = get_thread_lwp (event_thread); | |
2790 | *wstatp = event_child->status_pending; | |
2791 | event_child->status_pending_p = 0; | |
2792 | event_child->status_pending = 0; | |
2793 | break; | |
2794 | } | |
2795 | ||
fa96cb38 PA |
2796 | /* Check for zombie thread group leaders. Those can't be reaped |
2797 | until all other threads in the thread group are. */ | |
2798 | check_zombie_leaders (); | |
2799 | ||
2800 | /* If there are no resumed children left in the set of LWPs we | |
2801 | want to wait for, bail. We can't just block in | |
2802 | waitpid/sigsuspend, because lwps might have been left stopped | |
2803 | in trace-stop state, and we'd be stuck forever waiting for | |
2804 | their status to change (which would only happen if we resumed | |
2805 | them). Even if WNOHANG is set, this return code is preferred | |
2806 | over 0 (below), as it is more detailed. */ | |
2807 | if ((find_inferior (&all_threads, | |
2808 | not_stopped_callback, | |
2809 | &wait_ptid) == NULL)) | |
a6dbe5df | 2810 | { |
fa96cb38 PA |
2811 | if (debug_threads) |
2812 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2813 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2814 | return -1; | |
a6dbe5df PA |
2815 | } |
2816 | ||
fa96cb38 PA |
2817 | /* No interesting event to report to the caller. */ |
2818 | if ((options & WNOHANG)) | |
24a09b5f | 2819 | { |
fa96cb38 PA |
2820 | if (debug_threads) |
2821 | debug_printf ("WNOHANG set, no event found\n"); | |
2822 | ||
2823 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2824 | return 0; | |
24a09b5f DJ |
2825 | } |
2826 | ||
fa96cb38 PA |
2827 | /* Block until we get an event reported with SIGCHLD. */ |
2828 | if (debug_threads) | |
2829 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2830 | |
fa96cb38 PA |
2831 | sigsuspend (&prev_mask); |
2832 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2833 | goto retry; | |
2834 | } | |
d50171e4 | 2835 | |
fa96cb38 | 2836 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2837 | |
0bfdf32f | 2838 | current_thread = event_thread; |
d50171e4 | 2839 | |
fa96cb38 PA |
2840 | return lwpid_of (event_thread); |
2841 | } | |
2842 | ||
2843 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2844 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2845 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2846 | the stop status through the status pointer WSTAT. OPTIONS is | |
2847 | passed to the waitpid call. Return 0 if no event was found and | |
2848 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2849 | was found. Return the PID of the stopped child otherwise. */ | |
2850 | ||
2851 | static int | |
2852 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2853 | { | |
2854 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2855 | } |
2856 | ||
6bf5e0ba PA |
2857 | /* Count the LWP's that have had events. */ |
2858 | ||
2859 | static int | |
9c80ecd6 | 2860 | count_events_callback (thread_info *thread, void *data) |
6bf5e0ba | 2861 | { |
8bf3b159 | 2862 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2863 | int *count = (int *) data; |
6bf5e0ba PA |
2864 | |
2865 | gdb_assert (count != NULL); | |
2866 | ||
582511be | 2867 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2868 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2869 | && lp->status_pending_p) |
6bf5e0ba PA |
2870 | (*count)++; |
2871 | ||
2872 | return 0; | |
2873 | } | |
2874 | ||
2875 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2876 | ||
2877 | static int | |
9c80ecd6 | 2878 | select_singlestep_lwp_callback (thread_info *thread, void *data) |
6bf5e0ba | 2879 | { |
d86d4aaf | 2880 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba | 2881 | |
8336d594 PA |
2882 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2883 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2884 | && lp->status_pending_p) |
2885 | return 1; | |
2886 | else | |
2887 | return 0; | |
2888 | } | |
2889 | ||
b90fc188 | 2890 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2891 | |
2892 | static int | |
9c80ecd6 | 2893 | select_event_lwp_callback (thread_info *thread, void *data) |
6bf5e0ba | 2894 | { |
8bf3b159 | 2895 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2896 | int *selector = (int *) data; |
6bf5e0ba PA |
2897 | |
2898 | gdb_assert (selector != NULL); | |
2899 | ||
582511be | 2900 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2901 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2902 | && lp->status_pending_p) |
6bf5e0ba PA |
2903 | if ((*selector)-- == 0) |
2904 | return 1; | |
2905 | ||
2906 | return 0; | |
2907 | } | |
2908 | ||
6bf5e0ba PA |
2909 | /* Select one LWP out of those that have events pending. */ |
2910 | ||
2911 | static void | |
2912 | select_event_lwp (struct lwp_info **orig_lp) | |
2913 | { | |
2914 | int num_events = 0; | |
2915 | int random_selector; | |
582511be PA |
2916 | struct thread_info *event_thread = NULL; |
2917 | ||
2918 | /* In all-stop, give preference to the LWP that is being | |
2919 | single-stepped. There will be at most one, and it's the LWP that | |
2920 | the core is most interested in. If we didn't do this, then we'd | |
2921 | have to handle pending step SIGTRAPs somehow in case the core | |
2922 | later continues the previously-stepped thread, otherwise we'd | |
2923 | report the pending SIGTRAP, and the core, not having stepped the | |
2924 | thread, wouldn't understand what the trap was for, and therefore | |
2925 | would report it to the user as a random signal. */ | |
2926 | if (!non_stop) | |
6bf5e0ba | 2927 | { |
582511be PA |
2928 | event_thread |
2929 | = (struct thread_info *) find_inferior (&all_threads, | |
2930 | select_singlestep_lwp_callback, | |
2931 | NULL); | |
2932 | if (event_thread != NULL) | |
2933 | { | |
2934 | if (debug_threads) | |
2935 | debug_printf ("SEL: Select single-step %s\n", | |
2936 | target_pid_to_str (ptid_of (event_thread))); | |
2937 | } | |
6bf5e0ba | 2938 | } |
582511be | 2939 | if (event_thread == NULL) |
6bf5e0ba PA |
2940 | { |
2941 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2942 | which have had events. */ |
6bf5e0ba | 2943 | |
b90fc188 | 2944 | /* First see how many events we have. */ |
d86d4aaf | 2945 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2946 | gdb_assert (num_events > 0); |
6bf5e0ba | 2947 | |
b90fc188 PA |
2948 | /* Now randomly pick a LWP out of those that have had |
2949 | events. */ | |
6bf5e0ba PA |
2950 | random_selector = (int) |
2951 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2952 | ||
2953 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2954 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2955 | num_events, random_selector); | |
6bf5e0ba | 2956 | |
d86d4aaf DE |
2957 | event_thread |
2958 | = (struct thread_info *) find_inferior (&all_threads, | |
2959 | select_event_lwp_callback, | |
2960 | &random_selector); | |
6bf5e0ba PA |
2961 | } |
2962 | ||
d86d4aaf | 2963 | if (event_thread != NULL) |
6bf5e0ba | 2964 | { |
d86d4aaf DE |
2965 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2966 | ||
6bf5e0ba PA |
2967 | /* Switch the event LWP. */ |
2968 | *orig_lp = event_lp; | |
2969 | } | |
2970 | } | |
2971 | ||
7984d532 PA |
2972 | /* Decrement the suspend count of an LWP. */ |
2973 | ||
2974 | static int | |
9c80ecd6 | 2975 | unsuspend_one_lwp (thread_info *thread, void *except) |
7984d532 | 2976 | { |
d86d4aaf | 2977 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
2978 | |
2979 | /* Ignore EXCEPT. */ | |
2980 | if (lwp == except) | |
2981 | return 0; | |
2982 | ||
863d01bd | 2983 | lwp_suspended_decr (lwp); |
7984d532 PA |
2984 | return 0; |
2985 | } | |
2986 | ||
2987 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2988 | NULL. */ | |
2989 | ||
2990 | static void | |
2991 | unsuspend_all_lwps (struct lwp_info *except) | |
2992 | { | |
d86d4aaf | 2993 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2994 | } |
2995 | ||
9c80ecd6 SM |
2996 | static void move_out_of_jump_pad_callback (thread_info *thread); |
2997 | static int stuck_in_jump_pad_callback (thread_info *thread, void *data); | |
2998 | static int lwp_running (thread_info *thread, void *data); | |
fa593d66 PA |
2999 | static ptid_t linux_wait_1 (ptid_t ptid, |
3000 | struct target_waitstatus *ourstatus, | |
3001 | int target_options); | |
3002 | ||
3003 | /* Stabilize threads (move out of jump pads). | |
3004 | ||
3005 | If a thread is midway collecting a fast tracepoint, we need to | |
3006 | finish the collection and move it out of the jump pad before | |
3007 | reporting the signal. | |
3008 | ||
3009 | This avoids recursion while collecting (when a signal arrives | |
3010 | midway, and the signal handler itself collects), which would trash | |
3011 | the trace buffer. In case the user set a breakpoint in a signal | |
3012 | handler, this avoids the backtrace showing the jump pad, etc.. | |
3013 | Most importantly, there are certain things we can't do safely if | |
3014 | threads are stopped in a jump pad (or in its callee's). For | |
3015 | example: | |
3016 | ||
3017 | - starting a new trace run. A thread still collecting the | |
3018 | previous run, could trash the trace buffer when resumed. The trace | |
3019 | buffer control structures would have been reset but the thread had | |
3020 | no way to tell. The thread could even midway memcpy'ing to the | |
3021 | buffer, which would mean that when resumed, it would clobber the | |
3022 | trace buffer that had been set for a new run. | |
3023 | ||
3024 | - we can't rewrite/reuse the jump pads for new tracepoints | |
3025 | safely. Say you do tstart while a thread is stopped midway while | |
3026 | collecting. When the thread is later resumed, it finishes the | |
3027 | collection, and returns to the jump pad, to execute the original | |
3028 | instruction that was under the tracepoint jump at the time the | |
3029 | older run had been started. If the jump pad had been rewritten | |
3030 | since for something else in the new run, the thread would now | |
3031 | execute the wrong / random instructions. */ | |
3032 | ||
3033 | static void | |
3034 | linux_stabilize_threads (void) | |
3035 | { | |
0bfdf32f | 3036 | struct thread_info *saved_thread; |
d86d4aaf | 3037 | struct thread_info *thread_stuck; |
fa593d66 | 3038 | |
d86d4aaf DE |
3039 | thread_stuck |
3040 | = (struct thread_info *) find_inferior (&all_threads, | |
3041 | stuck_in_jump_pad_callback, | |
3042 | NULL); | |
3043 | if (thread_stuck != NULL) | |
fa593d66 | 3044 | { |
b4d51a55 | 3045 | if (debug_threads) |
87ce2a04 | 3046 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 3047 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3048 | return; |
3049 | } | |
3050 | ||
0bfdf32f | 3051 | saved_thread = current_thread; |
fa593d66 PA |
3052 | |
3053 | stabilizing_threads = 1; | |
3054 | ||
3055 | /* Kick 'em all. */ | |
d86d4aaf | 3056 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
3057 | |
3058 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 3059 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
3060 | { |
3061 | struct target_waitstatus ourstatus; | |
3062 | struct lwp_info *lwp; | |
fa593d66 PA |
3063 | int wstat; |
3064 | ||
3065 | /* Note that we go through the full wait even loop. While | |
3066 | moving threads out of jump pad, we need to be able to step | |
3067 | over internal breakpoints and such. */ | |
32fcada3 | 3068 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
3069 | |
3070 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
3071 | { | |
0bfdf32f | 3072 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
3073 | |
3074 | /* Lock it. */ | |
863d01bd | 3075 | lwp_suspended_inc (lwp); |
fa593d66 | 3076 | |
a493e3e2 | 3077 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 3078 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 3079 | { |
2ea28649 | 3080 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
3081 | enqueue_one_deferred_signal (lwp, &wstat); |
3082 | } | |
3083 | } | |
3084 | } | |
3085 | ||
fcdad592 | 3086 | unsuspend_all_lwps (NULL); |
fa593d66 PA |
3087 | |
3088 | stabilizing_threads = 0; | |
3089 | ||
0bfdf32f | 3090 | current_thread = saved_thread; |
fa593d66 | 3091 | |
b4d51a55 | 3092 | if (debug_threads) |
fa593d66 | 3093 | { |
d86d4aaf DE |
3094 | thread_stuck |
3095 | = (struct thread_info *) find_inferior (&all_threads, | |
3096 | stuck_in_jump_pad_callback, | |
3097 | NULL); | |
3098 | if (thread_stuck != NULL) | |
87ce2a04 | 3099 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 3100 | lwpid_of (thread_stuck)); |
fa593d66 PA |
3101 | } |
3102 | } | |
3103 | ||
582511be PA |
3104 | /* Convenience function that is called when the kernel reports an |
3105 | event that is not passed out to GDB. */ | |
3106 | ||
3107 | static ptid_t | |
3108 | ignore_event (struct target_waitstatus *ourstatus) | |
3109 | { | |
3110 | /* If we got an event, there may still be others, as a single | |
3111 | SIGCHLD can indicate more than one child stopped. This forces | |
3112 | another target_wait call. */ | |
3113 | async_file_mark (); | |
3114 | ||
3115 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3116 | return null_ptid; | |
3117 | } | |
3118 | ||
65706a29 PA |
3119 | /* Convenience function that is called when the kernel reports an exit |
3120 | event. This decides whether to report the event to GDB as a | |
3121 | process exit event, a thread exit event, or to suppress the | |
3122 | event. */ | |
3123 | ||
3124 | static ptid_t | |
3125 | filter_exit_event (struct lwp_info *event_child, | |
3126 | struct target_waitstatus *ourstatus) | |
3127 | { | |
3128 | struct thread_info *thread = get_lwp_thread (event_child); | |
3129 | ptid_t ptid = ptid_of (thread); | |
3130 | ||
3131 | if (!last_thread_of_process_p (pid_of (thread))) | |
3132 | { | |
3133 | if (report_thread_events) | |
3134 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
3135 | else | |
3136 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3137 | ||
3138 | delete_lwp (event_child); | |
3139 | } | |
3140 | return ptid; | |
3141 | } | |
3142 | ||
82075af2 JS |
3143 | /* Returns 1 if GDB is interested in any event_child syscalls. */ |
3144 | ||
3145 | static int | |
3146 | gdb_catching_syscalls_p (struct lwp_info *event_child) | |
3147 | { | |
3148 | struct thread_info *thread = get_lwp_thread (event_child); | |
3149 | struct process_info *proc = get_thread_process (thread); | |
3150 | ||
f27866ba | 3151 | return !proc->syscalls_to_catch.empty (); |
82075af2 JS |
3152 | } |
3153 | ||
3154 | /* Returns 1 if GDB is interested in the event_child syscall. | |
3155 | Only to be called when stopped reason is SYSCALL_SIGTRAP. */ | |
3156 | ||
3157 | static int | |
3158 | gdb_catch_this_syscall_p (struct lwp_info *event_child) | |
3159 | { | |
4cc32bec | 3160 | int sysno; |
82075af2 JS |
3161 | struct thread_info *thread = get_lwp_thread (event_child); |
3162 | struct process_info *proc = get_thread_process (thread); | |
3163 | ||
f27866ba | 3164 | if (proc->syscalls_to_catch.empty ()) |
82075af2 JS |
3165 | return 0; |
3166 | ||
f27866ba | 3167 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) |
82075af2 JS |
3168 | return 1; |
3169 | ||
4cc32bec | 3170 | get_syscall_trapinfo (event_child, &sysno); |
f27866ba SM |
3171 | |
3172 | for (int iter : proc->syscalls_to_catch) | |
82075af2 JS |
3173 | if (iter == sysno) |
3174 | return 1; | |
3175 | ||
3176 | return 0; | |
3177 | } | |
3178 | ||
0d62e5e8 | 3179 | /* Wait for process, returns status. */ |
da6d8c04 | 3180 | |
95954743 PA |
3181 | static ptid_t |
3182 | linux_wait_1 (ptid_t ptid, | |
3183 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 3184 | { |
e5f1222d | 3185 | int w; |
fc7238bb | 3186 | struct lwp_info *event_child; |
bd99dc85 | 3187 | int options; |
bd99dc85 | 3188 | int pid; |
6bf5e0ba PA |
3189 | int step_over_finished; |
3190 | int bp_explains_trap; | |
3191 | int maybe_internal_trap; | |
3192 | int report_to_gdb; | |
219f2f23 | 3193 | int trace_event; |
c2d6af84 | 3194 | int in_step_range; |
f2faf941 | 3195 | int any_resumed; |
bd99dc85 | 3196 | |
87ce2a04 DE |
3197 | if (debug_threads) |
3198 | { | |
3199 | debug_enter (); | |
3200 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
3201 | } | |
3202 | ||
bd99dc85 PA |
3203 | /* Translate generic target options into linux options. */ |
3204 | options = __WALL; | |
3205 | if (target_options & TARGET_WNOHANG) | |
3206 | options |= WNOHANG; | |
0d62e5e8 | 3207 | |
fa593d66 PA |
3208 | bp_explains_trap = 0; |
3209 | trace_event = 0; | |
c2d6af84 | 3210 | in_step_range = 0; |
bd99dc85 PA |
3211 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
3212 | ||
f2faf941 PA |
3213 | /* Find a resumed LWP, if any. */ |
3214 | if (find_inferior (&all_threads, | |
3215 | status_pending_p_callback, | |
3216 | &minus_one_ptid) != NULL) | |
3217 | any_resumed = 1; | |
3218 | else if ((find_inferior (&all_threads, | |
3219 | not_stopped_callback, | |
3220 | &minus_one_ptid) != NULL)) | |
3221 | any_resumed = 1; | |
3222 | else | |
3223 | any_resumed = 0; | |
3224 | ||
6bf5e0ba PA |
3225 | if (ptid_equal (step_over_bkpt, null_ptid)) |
3226 | pid = linux_wait_for_event (ptid, &w, options); | |
3227 | else | |
3228 | { | |
3229 | if (debug_threads) | |
87ce2a04 DE |
3230 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
3231 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
3232 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
3233 | } | |
3234 | ||
f2faf941 | 3235 | if (pid == 0 || (pid == -1 && !any_resumed)) |
87ce2a04 | 3236 | { |
fa96cb38 PA |
3237 | gdb_assert (target_options & TARGET_WNOHANG); |
3238 | ||
87ce2a04 DE |
3239 | if (debug_threads) |
3240 | { | |
fa96cb38 PA |
3241 | debug_printf ("linux_wait_1 ret = null_ptid, " |
3242 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
3243 | debug_exit (); |
3244 | } | |
fa96cb38 PA |
3245 | |
3246 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
3247 | return null_ptid; |
3248 | } | |
fa96cb38 PA |
3249 | else if (pid == -1) |
3250 | { | |
3251 | if (debug_threads) | |
3252 | { | |
3253 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
3254 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
3255 | debug_exit (); | |
3256 | } | |
bd99dc85 | 3257 | |
fa96cb38 PA |
3258 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
3259 | return null_ptid; | |
3260 | } | |
0d62e5e8 | 3261 | |
0bfdf32f | 3262 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 3263 | |
fa96cb38 PA |
3264 | /* linux_wait_for_event only returns an exit status for the last |
3265 | child of a process. Report it. */ | |
3266 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 3267 | { |
fa96cb38 | 3268 | if (WIFEXITED (w)) |
0d62e5e8 | 3269 | { |
fa96cb38 PA |
3270 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
3271 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 3272 | |
fa96cb38 | 3273 | if (debug_threads) |
bd99dc85 | 3274 | { |
fa96cb38 PA |
3275 | debug_printf ("linux_wait_1 ret = %s, exited with " |
3276 | "retcode %d\n", | |
0bfdf32f | 3277 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3278 | WEXITSTATUS (w)); |
3279 | debug_exit (); | |
bd99dc85 | 3280 | } |
fa96cb38 PA |
3281 | } |
3282 | else | |
3283 | { | |
3284 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
3285 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 3286 | |
fa96cb38 PA |
3287 | if (debug_threads) |
3288 | { | |
3289 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
3290 | "signal %d\n", | |
0bfdf32f | 3291 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
3292 | WTERMSIG (w)); |
3293 | debug_exit (); | |
3294 | } | |
0d62e5e8 | 3295 | } |
fa96cb38 | 3296 | |
65706a29 PA |
3297 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3298 | return filter_exit_event (event_child, ourstatus); | |
3299 | ||
0bfdf32f | 3300 | return ptid_of (current_thread); |
da6d8c04 DJ |
3301 | } |
3302 | ||
2d97cd35 AT |
3303 | /* If step-over executes a breakpoint instruction, in the case of a |
3304 | hardware single step it means a gdb/gdbserver breakpoint had been | |
3305 | planted on top of a permanent breakpoint, in the case of a software | |
3306 | single step it may just mean that gdbserver hit the reinsert breakpoint. | |
e7ad2f14 | 3307 | The PC has been adjusted by save_stop_reason to point at |
2d97cd35 AT |
3308 | the breakpoint address. |
3309 | So in the case of the hardware single step advance the PC manually | |
3310 | past the breakpoint and in the case of software single step advance only | |
3b9a79ef | 3311 | if it's not the single_step_breakpoint we are hitting. |
2d97cd35 AT |
3312 | This avoids that a program would keep trapping a permanent breakpoint |
3313 | forever. */ | |
8090aef2 | 3314 | if (!ptid_equal (step_over_bkpt, null_ptid) |
2d97cd35 AT |
3315 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
3316 | && (event_child->stepping | |
3b9a79ef | 3317 | || !single_step_breakpoint_inserted_here (event_child->stop_pc))) |
8090aef2 | 3318 | { |
dd373349 AT |
3319 | int increment_pc = 0; |
3320 | int breakpoint_kind = 0; | |
3321 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3322 | ||
769ef81f AT |
3323 | breakpoint_kind = |
3324 | the_target->breakpoint_kind_from_current_state (&stop_pc); | |
dd373349 | 3325 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); |
8090aef2 PA |
3326 | |
3327 | if (debug_threads) | |
3328 | { | |
3329 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3330 | target_pid_to_str (ptid_of (current_thread))); | |
3331 | } | |
3332 | ||
3333 | if (increment_pc != 0) | |
3334 | { | |
3335 | struct regcache *regcache | |
3336 | = get_thread_regcache (current_thread, 1); | |
3337 | ||
3338 | event_child->stop_pc += increment_pc; | |
3339 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3340 | ||
3341 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3342 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3343 | } |
3344 | } | |
3345 | ||
6bf5e0ba PA |
3346 | /* If this event was not handled before, and is not a SIGTRAP, we |
3347 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3348 | a breakpoint is inserted at the current PC. If this target does | |
3349 | not support internal breakpoints at all, we also report the | |
3350 | SIGTRAP without further processing; it's of no concern to us. */ | |
3351 | maybe_internal_trap | |
3352 | = (supports_breakpoints () | |
3353 | && (WSTOPSIG (w) == SIGTRAP | |
3354 | || ((WSTOPSIG (w) == SIGILL | |
3355 | || WSTOPSIG (w) == SIGSEGV) | |
3356 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3357 | ||
3358 | if (maybe_internal_trap) | |
3359 | { | |
3360 | /* Handle anything that requires bookkeeping before deciding to | |
3361 | report the event or continue waiting. */ | |
3362 | ||
3363 | /* First check if we can explain the SIGTRAP with an internal | |
3364 | breakpoint, or if we should possibly report the event to GDB. | |
3365 | Do this before anything that may remove or insert a | |
3366 | breakpoint. */ | |
3367 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3368 | ||
3369 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3370 | finished. If so, tweak the state machine accordingly, | |
3b9a79ef YQ |
3371 | reinsert breakpoints and delete any single-step |
3372 | breakpoints. */ | |
6bf5e0ba PA |
3373 | step_over_finished = finish_step_over (event_child); |
3374 | ||
3375 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3376 | check_breakpoints (event_child->stop_pc); | |
3377 | ||
219f2f23 PA |
3378 | /* Handle tracepoint data collecting. This may overflow the |
3379 | trace buffer, and cause a tracing stop, removing | |
3380 | breakpoints. */ | |
3381 | trace_event = handle_tracepoints (event_child); | |
3382 | ||
6bf5e0ba PA |
3383 | if (bp_explains_trap) |
3384 | { | |
6bf5e0ba | 3385 | if (debug_threads) |
87ce2a04 | 3386 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba PA |
3387 | } |
3388 | } | |
3389 | else | |
3390 | { | |
3391 | /* We have some other signal, possibly a step-over dance was in | |
3392 | progress, and it should be cancelled too. */ | |
3393 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3394 | } |
3395 | ||
3396 | /* We have all the data we need. Either report the event to GDB, or | |
3397 | resume threads and keep waiting for more. */ | |
3398 | ||
3399 | /* If we're collecting a fast tracepoint, finish the collection and | |
3400 | move out of the jump pad before delivering a signal. See | |
3401 | linux_stabilize_threads. */ | |
3402 | ||
3403 | if (WIFSTOPPED (w) | |
3404 | && WSTOPSIG (w) != SIGTRAP | |
3405 | && supports_fast_tracepoints () | |
58b4daa5 | 3406 | && agent_loaded_p ()) |
fa593d66 PA |
3407 | { |
3408 | if (debug_threads) | |
87ce2a04 DE |
3409 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3410 | "to defer or adjust it.\n", | |
0bfdf32f | 3411 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3412 | |
3413 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3414 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3415 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3416 | { | |
3417 | enqueue_one_deferred_signal (event_child, &w); | |
3418 | ||
3419 | if (debug_threads) | |
87ce2a04 | 3420 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3421 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3422 | |
3423 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be | 3424 | |
edeeb602 YQ |
3425 | if (debug_threads) |
3426 | debug_exit (); | |
582511be | 3427 | return ignore_event (ourstatus); |
fa593d66 PA |
3428 | } |
3429 | } | |
219f2f23 | 3430 | |
229d26fc SM |
3431 | if (event_child->collecting_fast_tracepoint |
3432 | != fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3433 | { |
3434 | if (debug_threads) | |
87ce2a04 DE |
3435 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3436 | "Check if we're already there.\n", | |
0bfdf32f | 3437 | lwpid_of (current_thread), |
229d26fc | 3438 | (int) event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3439 | |
3440 | trace_event = 1; | |
3441 | ||
3442 | event_child->collecting_fast_tracepoint | |
3443 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3444 | ||
229d26fc SM |
3445 | if (event_child->collecting_fast_tracepoint |
3446 | != fast_tpoint_collect_result::before_insn) | |
fa593d66 PA |
3447 | { |
3448 | /* No longer need this breakpoint. */ | |
3449 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3450 | { | |
3451 | if (debug_threads) | |
87ce2a04 DE |
3452 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3453 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3454 | |
3455 | /* Other running threads could hit this breakpoint. | |
3456 | We don't handle moribund locations like GDB does, | |
3457 | instead we always pause all threads when removing | |
3458 | breakpoints, so that any step-over or | |
3459 | decr_pc_after_break adjustment is always taken | |
3460 | care of while the breakpoint is still | |
3461 | inserted. */ | |
3462 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3463 | |
3464 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3465 | event_child->exit_jump_pad_bkpt = NULL; | |
3466 | ||
3467 | unstop_all_lwps (1, event_child); | |
3468 | ||
3469 | gdb_assert (event_child->suspended >= 0); | |
3470 | } | |
3471 | } | |
3472 | ||
229d26fc SM |
3473 | if (event_child->collecting_fast_tracepoint |
3474 | == fast_tpoint_collect_result::not_collecting) | |
fa593d66 PA |
3475 | { |
3476 | if (debug_threads) | |
87ce2a04 DE |
3477 | debug_printf ("fast tracepoint finished " |
3478 | "collecting successfully.\n"); | |
fa593d66 PA |
3479 | |
3480 | /* We may have a deferred signal to report. */ | |
3481 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3482 | { | |
3483 | if (debug_threads) | |
87ce2a04 | 3484 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3485 | } |
3c11dd79 | 3486 | else |
fa593d66 | 3487 | { |
3c11dd79 | 3488 | if (debug_threads) |
87ce2a04 | 3489 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3490 | |
3491 | if (stabilizing_threads) | |
3492 | { | |
3493 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3494 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3495 | |
3496 | if (debug_threads) | |
3497 | { | |
3498 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3499 | "while stabilizing threads\n", | |
0bfdf32f | 3500 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3501 | debug_exit (); |
3502 | } | |
3503 | ||
0bfdf32f | 3504 | return ptid_of (current_thread); |
fa593d66 PA |
3505 | } |
3506 | } | |
3507 | } | |
6bf5e0ba PA |
3508 | } |
3509 | ||
e471f25b PA |
3510 | /* Check whether GDB would be interested in this event. */ |
3511 | ||
82075af2 JS |
3512 | /* Check if GDB is interested in this syscall. */ |
3513 | if (WIFSTOPPED (w) | |
3514 | && WSTOPSIG (w) == SYSCALL_SIGTRAP | |
3515 | && !gdb_catch_this_syscall_p (event_child)) | |
3516 | { | |
3517 | if (debug_threads) | |
3518 | { | |
3519 | debug_printf ("Ignored syscall for LWP %ld.\n", | |
3520 | lwpid_of (current_thread)); | |
3521 | } | |
3522 | ||
3523 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3524 | 0, NULL); | |
edeeb602 YQ |
3525 | |
3526 | if (debug_threads) | |
3527 | debug_exit (); | |
82075af2 JS |
3528 | return ignore_event (ourstatus); |
3529 | } | |
3530 | ||
e471f25b PA |
3531 | /* If GDB is not interested in this signal, don't stop other |
3532 | threads, and don't report it to GDB. Just resume the inferior | |
3533 | right away. We do this for threading-related signals as well as | |
3534 | any that GDB specifically requested we ignore. But never ignore | |
3535 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3536 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3537 | handler. Also never ignore signals that could be caused by a |
3538 | breakpoint. */ | |
e471f25b | 3539 | if (WIFSTOPPED (w) |
0bfdf32f | 3540 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3541 | && ( |
1a981360 | 3542 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3543 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3544 | && (WSTOPSIG (w) == __SIGRTMIN |
3545 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3546 | || | |
3547 | #endif | |
2ea28649 | 3548 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3549 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3550 | && current_thread->last_resume_kind == resume_stop) |
3551 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3552 | { |
3553 | siginfo_t info, *info_p; | |
3554 | ||
3555 | if (debug_threads) | |
87ce2a04 | 3556 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3557 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3558 | |
0bfdf32f | 3559 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3560 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3561 | info_p = &info; |
3562 | else | |
3563 | info_p = NULL; | |
863d01bd PA |
3564 | |
3565 | if (step_over_finished) | |
3566 | { | |
3567 | /* We cancelled this thread's step-over above. We still | |
3568 | need to unsuspend all other LWPs, and set them back | |
3569 | running again while the signal handler runs. */ | |
3570 | unsuspend_all_lwps (event_child); | |
3571 | ||
3572 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3573 | doesn't lose it. */ | |
3574 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3575 | ||
3576 | proceed_all_lwps (); | |
3577 | } | |
3578 | else | |
3579 | { | |
3580 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3581 | WSTOPSIG (w), info_p); | |
3582 | } | |
edeeb602 YQ |
3583 | |
3584 | if (debug_threads) | |
3585 | debug_exit (); | |
3586 | ||
582511be | 3587 | return ignore_event (ourstatus); |
e471f25b PA |
3588 | } |
3589 | ||
c2d6af84 PA |
3590 | /* Note that all addresses are always "out of the step range" when |
3591 | there's no range to begin with. */ | |
3592 | in_step_range = lwp_in_step_range (event_child); | |
3593 | ||
3594 | /* If GDB wanted this thread to single step, and the thread is out | |
3595 | of the step range, we always want to report the SIGTRAP, and let | |
3596 | GDB handle it. Watchpoints should always be reported. So should | |
3597 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3598 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3599 | do, we're be able to handle GDB breakpoints on top of internal | |
3600 | breakpoints, by handling the internal breakpoint and still | |
3601 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3602 | won't see the breakpoint hit. If we see a single-step event but |
3603 | the thread should be continuing, don't pass the trap to gdb. | |
3604 | That indicates that we had previously finished a single-step but | |
3605 | left the single-step pending -- see | |
3606 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3607 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3608 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3609 | && !in_step_range) |
15c66dd6 | 3610 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3611 | || (!in_step_range |
3612 | && !bp_explains_trap | |
3613 | && !trace_event | |
3614 | && !step_over_finished | |
3615 | && !(current_thread->last_resume_kind == resume_continue | |
3616 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3617 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3618 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3619 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3620 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3621 | |
3622 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3623 | |
3624 | /* We found no reason GDB would want us to stop. We either hit one | |
3625 | of our own breakpoints, or finished an internal step GDB | |
3626 | shouldn't know about. */ | |
3627 | if (!report_to_gdb) | |
3628 | { | |
3629 | if (debug_threads) | |
3630 | { | |
3631 | if (bp_explains_trap) | |
87ce2a04 | 3632 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3633 | if (step_over_finished) |
87ce2a04 | 3634 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3635 | if (trace_event) |
87ce2a04 | 3636 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3637 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3638 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3639 | paddress (event_child->stop_pc), | |
3640 | paddress (event_child->step_range_start), | |
3641 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3642 | } |
3643 | ||
3644 | /* We're not reporting this breakpoint to GDB, so apply the | |
3645 | decr_pc_after_break adjustment to the inferior's regcache | |
3646 | ourselves. */ | |
3647 | ||
3648 | if (the_low_target.set_pc != NULL) | |
3649 | { | |
3650 | struct regcache *regcache | |
0bfdf32f | 3651 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3652 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3653 | } | |
3654 | ||
7984d532 | 3655 | if (step_over_finished) |
e3652c84 YQ |
3656 | { |
3657 | /* If we have finished stepping over a breakpoint, we've | |
3658 | stopped and suspended all LWPs momentarily except the | |
3659 | stepping one. This is where we resume them all again. | |
3660 | We're going to keep waiting, so use proceed, which | |
3661 | handles stepping over the next breakpoint. */ | |
3662 | unsuspend_all_lwps (event_child); | |
3663 | } | |
3664 | else | |
3665 | { | |
3666 | /* Remove the single-step breakpoints if any. Note that | |
3667 | there isn't single-step breakpoint if we finished stepping | |
3668 | over. */ | |
3669 | if (can_software_single_step () | |
3670 | && has_single_step_breakpoints (current_thread)) | |
3671 | { | |
3672 | stop_all_lwps (0, event_child); | |
3673 | delete_single_step_breakpoints (current_thread); | |
3674 | unstop_all_lwps (0, event_child); | |
3675 | } | |
3676 | } | |
7984d532 | 3677 | |
e3652c84 YQ |
3678 | if (debug_threads) |
3679 | debug_printf ("proceeding all threads.\n"); | |
6bf5e0ba | 3680 | proceed_all_lwps (); |
edeeb602 YQ |
3681 | |
3682 | if (debug_threads) | |
3683 | debug_exit (); | |
3684 | ||
582511be | 3685 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3686 | } |
3687 | ||
3688 | if (debug_threads) | |
3689 | { | |
00db26fa | 3690 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 | 3691 | { |
23fdd69e SM |
3692 | std::string str |
3693 | = target_waitstatus_to_string (&event_child->waitstatus); | |
ad071a30 | 3694 | |
ad071a30 | 3695 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", |
23fdd69e | 3696 | lwpid_of (get_lwp_thread (event_child)), str.c_str ()); |
ad071a30 | 3697 | } |
0bfdf32f | 3698 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3699 | { |
3700 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3701 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3702 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3703 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3704 | } |
15c66dd6 | 3705 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3706 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3707 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3708 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3709 | if (debug_threads) |
87ce2a04 | 3710 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3711 | } |
3712 | ||
3713 | /* Alright, we're going to report a stop. */ | |
3714 | ||
3b9a79ef | 3715 | /* Remove single-step breakpoints. */ |
8901d193 YQ |
3716 | if (can_software_single_step ()) |
3717 | { | |
3b9a79ef | 3718 | /* Remove single-step breakpoints or not. It it is true, stop all |
8901d193 YQ |
3719 | lwps, so that other threads won't hit the breakpoint in the |
3720 | staled memory. */ | |
3b9a79ef | 3721 | int remove_single_step_breakpoints_p = 0; |
8901d193 YQ |
3722 | |
3723 | if (non_stop) | |
3724 | { | |
3b9a79ef YQ |
3725 | remove_single_step_breakpoints_p |
3726 | = has_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3727 | } |
3728 | else | |
3729 | { | |
3730 | /* In all-stop, a stop reply cancels all previous resume | |
3b9a79ef | 3731 | requests. Delete all single-step breakpoints. */ |
8901d193 | 3732 | |
9c80ecd6 SM |
3733 | find_thread ([&] (thread_info *thread) { |
3734 | if (has_single_step_breakpoints (thread)) | |
3735 | { | |
3736 | remove_single_step_breakpoints_p = 1; | |
3737 | return true; | |
3738 | } | |
8901d193 | 3739 | |
9c80ecd6 SM |
3740 | return false; |
3741 | }); | |
8901d193 YQ |
3742 | } |
3743 | ||
3b9a79ef | 3744 | if (remove_single_step_breakpoints_p) |
8901d193 | 3745 | { |
3b9a79ef | 3746 | /* If we remove single-step breakpoints from memory, stop all lwps, |
8901d193 YQ |
3747 | so that other threads won't hit the breakpoint in the staled |
3748 | memory. */ | |
3749 | stop_all_lwps (0, event_child); | |
3750 | ||
3751 | if (non_stop) | |
3752 | { | |
3b9a79ef YQ |
3753 | gdb_assert (has_single_step_breakpoints (current_thread)); |
3754 | delete_single_step_breakpoints (current_thread); | |
8901d193 YQ |
3755 | } |
3756 | else | |
3757 | { | |
9c80ecd6 SM |
3758 | for_each_thread ([] (thread_info *thread){ |
3759 | if (has_single_step_breakpoints (thread)) | |
3760 | delete_single_step_breakpoints (thread); | |
3761 | }); | |
8901d193 YQ |
3762 | } |
3763 | ||
3764 | unstop_all_lwps (0, event_child); | |
3765 | } | |
3766 | } | |
3767 | ||
582511be | 3768 | if (!stabilizing_threads) |
6bf5e0ba PA |
3769 | { |
3770 | /* In all-stop, stop all threads. */ | |
582511be PA |
3771 | if (!non_stop) |
3772 | stop_all_lwps (0, NULL); | |
6bf5e0ba | 3773 | |
c03e6ccc | 3774 | if (step_over_finished) |
582511be PA |
3775 | { |
3776 | if (!non_stop) | |
3777 | { | |
3778 | /* If we were doing a step-over, all other threads but | |
3779 | the stepping one had been paused in start_step_over, | |
3780 | with their suspend counts incremented. We don't want | |
3781 | to do a full unstop/unpause, because we're in | |
3782 | all-stop mode (so we want threads stopped), but we | |
3783 | still need to unsuspend the other threads, to | |
3784 | decrement their `suspended' count back. */ | |
3785 | unsuspend_all_lwps (event_child); | |
3786 | } | |
3787 | else | |
3788 | { | |
3789 | /* If we just finished a step-over, then all threads had | |
3790 | been momentarily paused. In all-stop, that's fine, | |
3791 | we want threads stopped by now anyway. In non-stop, | |
3792 | we need to re-resume threads that GDB wanted to be | |
3793 | running. */ | |
3794 | unstop_all_lwps (1, event_child); | |
3795 | } | |
3796 | } | |
c03e6ccc | 3797 | |
3aa5cfa0 AT |
3798 | /* If we're not waiting for a specific LWP, choose an event LWP |
3799 | from among those that have had events. Giving equal priority | |
3800 | to all LWPs that have had events helps prevent | |
3801 | starvation. */ | |
3802 | if (ptid_equal (ptid, minus_one_ptid)) | |
3803 | { | |
3804 | event_child->status_pending_p = 1; | |
3805 | event_child->status_pending = w; | |
3806 | ||
3807 | select_event_lwp (&event_child); | |
3808 | ||
3809 | /* current_thread and event_child must stay in sync. */ | |
3810 | current_thread = get_lwp_thread (event_child); | |
3811 | ||
3812 | event_child->status_pending_p = 0; | |
3813 | w = event_child->status_pending; | |
3814 | } | |
3815 | ||
3816 | ||
fa593d66 | 3817 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3818 | if (!non_stop) |
3819 | stabilize_threads (); | |
6bf5e0ba PA |
3820 | } |
3821 | else | |
3822 | { | |
3823 | /* If we just finished a step-over, then all threads had been | |
3824 | momentarily paused. In all-stop, that's fine, we want | |
3825 | threads stopped by now anyway. In non-stop, we need to | |
3826 | re-resume threads that GDB wanted to be running. */ | |
3827 | if (step_over_finished) | |
7984d532 | 3828 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3829 | } |
3830 | ||
00db26fa | 3831 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3832 | { |
00db26fa PA |
3833 | /* If the reported event is an exit, fork, vfork or exec, let |
3834 | GDB know. */ | |
5a04c4cf PA |
3835 | |
3836 | /* Break the unreported fork relationship chain. */ | |
3837 | if (event_child->waitstatus.kind == TARGET_WAITKIND_FORKED | |
3838 | || event_child->waitstatus.kind == TARGET_WAITKIND_VFORKED) | |
3839 | { | |
3840 | event_child->fork_relative->fork_relative = NULL; | |
3841 | event_child->fork_relative = NULL; | |
3842 | } | |
3843 | ||
00db26fa | 3844 | *ourstatus = event_child->waitstatus; |
de0d863e DB |
3845 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3846 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3847 | } | |
3848 | else | |
3849 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3850 | |
582511be | 3851 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3852 | it was a software breakpoint, and the client doesn't know we can |
3853 | adjust the breakpoint ourselves. */ | |
3854 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3855 | && !swbreak_feature) | |
582511be PA |
3856 | { |
3857 | int decr_pc = the_low_target.decr_pc_after_break; | |
3858 | ||
3859 | if (decr_pc != 0) | |
3860 | { | |
3861 | struct regcache *regcache | |
3862 | = get_thread_regcache (current_thread, 1); | |
3863 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3864 | } | |
3865 | } | |
3866 | ||
82075af2 JS |
3867 | if (WSTOPSIG (w) == SYSCALL_SIGTRAP) |
3868 | { | |
82075af2 | 3869 | get_syscall_trapinfo (event_child, |
4cc32bec | 3870 | &ourstatus->value.syscall_number); |
82075af2 JS |
3871 | ourstatus->kind = event_child->syscall_state; |
3872 | } | |
3873 | else if (current_thread->last_resume_kind == resume_stop | |
3874 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
3875 | { |
3876 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3877 | and it stopped cleanly, so report as SIG0. The use of | |
3878 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3879 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3880 | } |
0bfdf32f | 3881 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3882 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3883 | { |
3884 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3885 | but, it stopped for other reasons. */ |
2ea28649 | 3886 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3887 | } |
de0d863e | 3888 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3889 | { |
2ea28649 | 3890 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3891 | } |
3892 | ||
d50171e4 PA |
3893 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3894 | ||
bd99dc85 | 3895 | if (debug_threads) |
87ce2a04 DE |
3896 | { |
3897 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3898 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3899 | ourstatus->kind, ourstatus->value.sig); |
3900 | debug_exit (); | |
3901 | } | |
bd99dc85 | 3902 | |
65706a29 PA |
3903 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
3904 | return filter_exit_event (event_child, ourstatus); | |
3905 | ||
0bfdf32f | 3906 | return ptid_of (current_thread); |
bd99dc85 PA |
3907 | } |
3908 | ||
3909 | /* Get rid of any pending event in the pipe. */ | |
3910 | static void | |
3911 | async_file_flush (void) | |
3912 | { | |
3913 | int ret; | |
3914 | char buf; | |
3915 | ||
3916 | do | |
3917 | ret = read (linux_event_pipe[0], &buf, 1); | |
3918 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3919 | } | |
3920 | ||
3921 | /* Put something in the pipe, so the event loop wakes up. */ | |
3922 | static void | |
3923 | async_file_mark (void) | |
3924 | { | |
3925 | int ret; | |
3926 | ||
3927 | async_file_flush (); | |
3928 | ||
3929 | do | |
3930 | ret = write (linux_event_pipe[1], "+", 1); | |
3931 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3932 | ||
3933 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3934 | be awakened anyway. */ | |
3935 | } | |
3936 | ||
95954743 PA |
3937 | static ptid_t |
3938 | linux_wait (ptid_t ptid, | |
3939 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3940 | { |
95954743 | 3941 | ptid_t event_ptid; |
bd99dc85 | 3942 | |
bd99dc85 PA |
3943 | /* Flush the async file first. */ |
3944 | if (target_is_async_p ()) | |
3945 | async_file_flush (); | |
3946 | ||
582511be PA |
3947 | do |
3948 | { | |
3949 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3950 | } | |
3951 | while ((target_options & TARGET_WNOHANG) == 0 | |
3952 | && ptid_equal (event_ptid, null_ptid) | |
3953 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3954 | |
3955 | /* If at least one stop was reported, there may be more. A single | |
3956 | SIGCHLD can signal more than one child stop. */ | |
3957 | if (target_is_async_p () | |
3958 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3959 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3960 | async_file_mark (); |
3961 | ||
3962 | return event_ptid; | |
da6d8c04 DJ |
3963 | } |
3964 | ||
c5f62d5f | 3965 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3966 | |
3967 | static int | |
a1928bad | 3968 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3969 | { |
4a6ed09b | 3970 | int ret; |
fd500816 | 3971 | |
4a6ed09b PA |
3972 | errno = 0; |
3973 | ret = syscall (__NR_tkill, lwpid, signo); | |
3974 | if (errno == ENOSYS) | |
3975 | { | |
3976 | /* If tkill fails, then we are not using nptl threads, a | |
3977 | configuration we no longer support. */ | |
3978 | perror_with_name (("tkill")); | |
3979 | } | |
3980 | return ret; | |
fd500816 DJ |
3981 | } |
3982 | ||
964e4306 PA |
3983 | void |
3984 | linux_stop_lwp (struct lwp_info *lwp) | |
3985 | { | |
3986 | send_sigstop (lwp); | |
3987 | } | |
3988 | ||
0d62e5e8 | 3989 | static void |
02fc4de7 | 3990 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3991 | { |
bd99dc85 | 3992 | int pid; |
0d62e5e8 | 3993 | |
d86d4aaf | 3994 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3995 | |
0d62e5e8 DJ |
3996 | /* If we already have a pending stop signal for this process, don't |
3997 | send another. */ | |
54a0b537 | 3998 | if (lwp->stop_expected) |
0d62e5e8 | 3999 | { |
ae13219e | 4000 | if (debug_threads) |
87ce2a04 | 4001 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 4002 | |
0d62e5e8 DJ |
4003 | return; |
4004 | } | |
4005 | ||
4006 | if (debug_threads) | |
87ce2a04 | 4007 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 4008 | |
d50171e4 | 4009 | lwp->stop_expected = 1; |
bd99dc85 | 4010 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
4011 | } |
4012 | ||
7984d532 | 4013 | static int |
9c80ecd6 | 4014 | send_sigstop_callback (thread_info *thread, void *except) |
02fc4de7 | 4015 | { |
d86d4aaf | 4016 | struct lwp_info *lwp = get_thread_lwp (thread); |
02fc4de7 | 4017 | |
7984d532 PA |
4018 | /* Ignore EXCEPT. */ |
4019 | if (lwp == except) | |
4020 | return 0; | |
4021 | ||
02fc4de7 | 4022 | if (lwp->stopped) |
7984d532 | 4023 | return 0; |
02fc4de7 PA |
4024 | |
4025 | send_sigstop (lwp); | |
7984d532 PA |
4026 | return 0; |
4027 | } | |
4028 | ||
4029 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
4030 | yet. */ | |
4031 | static int | |
9c80ecd6 | 4032 | suspend_and_send_sigstop_callback (thread_info *thread, void *except) |
7984d532 | 4033 | { |
d86d4aaf | 4034 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
4035 | |
4036 | /* Ignore EXCEPT. */ | |
4037 | if (lwp == except) | |
4038 | return 0; | |
4039 | ||
863d01bd | 4040 | lwp_suspended_inc (lwp); |
7984d532 | 4041 | |
9c80ecd6 | 4042 | return send_sigstop_callback (thread, except); |
02fc4de7 PA |
4043 | } |
4044 | ||
95954743 PA |
4045 | static void |
4046 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
4047 | { | |
95954743 PA |
4048 | /* Store the exit status for later. */ |
4049 | lwp->status_pending_p = 1; | |
4050 | lwp->status_pending = wstat; | |
4051 | ||
00db26fa PA |
4052 | /* Store in waitstatus as well, as there's nothing else to process |
4053 | for this event. */ | |
4054 | if (WIFEXITED (wstat)) | |
4055 | { | |
4056 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
4057 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
4058 | } | |
4059 | else if (WIFSIGNALED (wstat)) | |
4060 | { | |
4061 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
4062 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
4063 | } | |
4064 | ||
95954743 PA |
4065 | /* Prevent trying to stop it. */ |
4066 | lwp->stopped = 1; | |
4067 | ||
4068 | /* No further stops are expected from a dead lwp. */ | |
4069 | lwp->stop_expected = 0; | |
4070 | } | |
4071 | ||
00db26fa PA |
4072 | /* Return true if LWP has exited already, and has a pending exit event |
4073 | to report to GDB. */ | |
4074 | ||
4075 | static int | |
4076 | lwp_is_marked_dead (struct lwp_info *lwp) | |
4077 | { | |
4078 | return (lwp->status_pending_p | |
4079 | && (WIFEXITED (lwp->status_pending) | |
4080 | || WIFSIGNALED (lwp->status_pending))); | |
4081 | } | |
4082 | ||
fa96cb38 PA |
4083 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
4084 | ||
0d62e5e8 | 4085 | static void |
fa96cb38 | 4086 | wait_for_sigstop (void) |
0d62e5e8 | 4087 | { |
0bfdf32f | 4088 | struct thread_info *saved_thread; |
95954743 | 4089 | ptid_t saved_tid; |
fa96cb38 PA |
4090 | int wstat; |
4091 | int ret; | |
0d62e5e8 | 4092 | |
0bfdf32f GB |
4093 | saved_thread = current_thread; |
4094 | if (saved_thread != NULL) | |
9c80ecd6 | 4095 | saved_tid = saved_thread->id; |
bd99dc85 | 4096 | else |
95954743 | 4097 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 4098 | |
d50171e4 | 4099 | if (debug_threads) |
fa96cb38 | 4100 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 4101 | |
fa96cb38 PA |
4102 | /* Passing NULL_PTID as filter indicates we want all events to be |
4103 | left pending. Eventually this returns when there are no | |
4104 | unwaited-for children left. */ | |
4105 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4106 | &wstat, __WALL); | |
4107 | gdb_assert (ret == -1); | |
0d62e5e8 | 4108 | |
0bfdf32f GB |
4109 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
4110 | current_thread = saved_thread; | |
0d62e5e8 DJ |
4111 | else |
4112 | { | |
4113 | if (debug_threads) | |
87ce2a04 | 4114 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 4115 | |
f0db101d PA |
4116 | /* We can't change the current inferior behind GDB's back, |
4117 | otherwise, a subsequent command may apply to the wrong | |
4118 | process. */ | |
4119 | current_thread = NULL; | |
0d62e5e8 DJ |
4120 | } |
4121 | } | |
4122 | ||
fa593d66 PA |
4123 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
4124 | move it out, because we need to report the stop event to GDB. For | |
4125 | example, if the user puts a breakpoint in the jump pad, it's | |
4126 | because she wants to debug it. */ | |
4127 | ||
4128 | static int | |
9c80ecd6 | 4129 | stuck_in_jump_pad_callback (thread_info *thread, void *data) |
fa593d66 | 4130 | { |
d86d4aaf | 4131 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4132 | |
863d01bd PA |
4133 | if (lwp->suspended != 0) |
4134 | { | |
4135 | internal_error (__FILE__, __LINE__, | |
4136 | "LWP %ld is suspended, suspended=%d\n", | |
4137 | lwpid_of (thread), lwp->suspended); | |
4138 | } | |
fa593d66 PA |
4139 | gdb_assert (lwp->stopped); |
4140 | ||
4141 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
4142 | return (supports_fast_tracepoints () | |
58b4daa5 | 4143 | && agent_loaded_p () |
fa593d66 | 4144 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 4145 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 | 4146 | || thread->last_resume_kind == resume_step) |
229d26fc SM |
4147 | && (linux_fast_tracepoint_collecting (lwp, NULL) |
4148 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 PA |
4149 | } |
4150 | ||
4151 | static void | |
9c80ecd6 | 4152 | move_out_of_jump_pad_callback (thread_info *thread) |
fa593d66 | 4153 | { |
f0ce0d3a | 4154 | struct thread_info *saved_thread; |
d86d4aaf | 4155 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
4156 | int *wstat; |
4157 | ||
863d01bd PA |
4158 | if (lwp->suspended != 0) |
4159 | { | |
4160 | internal_error (__FILE__, __LINE__, | |
4161 | "LWP %ld is suspended, suspended=%d\n", | |
4162 | lwpid_of (thread), lwp->suspended); | |
4163 | } | |
fa593d66 PA |
4164 | gdb_assert (lwp->stopped); |
4165 | ||
f0ce0d3a PA |
4166 | /* For gdb_breakpoint_here. */ |
4167 | saved_thread = current_thread; | |
4168 | current_thread = thread; | |
4169 | ||
fa593d66 PA |
4170 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
4171 | ||
4172 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
4173 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 4174 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
4175 | && thread->last_resume_kind != resume_step |
4176 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
4177 | { | |
4178 | if (debug_threads) | |
87ce2a04 | 4179 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 4180 | lwpid_of (thread)); |
fa593d66 PA |
4181 | |
4182 | if (wstat) | |
4183 | { | |
4184 | lwp->status_pending_p = 0; | |
4185 | enqueue_one_deferred_signal (lwp, wstat); | |
4186 | ||
4187 | if (debug_threads) | |
87ce2a04 DE |
4188 | debug_printf ("Signal %d for LWP %ld deferred " |
4189 | "(in jump pad)\n", | |
d86d4aaf | 4190 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
4191 | } |
4192 | ||
4193 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
4194 | } | |
4195 | else | |
863d01bd | 4196 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
4197 | |
4198 | current_thread = saved_thread; | |
fa593d66 PA |
4199 | } |
4200 | ||
4201 | static int | |
9c80ecd6 | 4202 | lwp_running (thread_info *thread, void *data) |
fa593d66 | 4203 | { |
d86d4aaf | 4204 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 | 4205 | |
00db26fa | 4206 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
4207 | return 0; |
4208 | if (lwp->stopped) | |
4209 | return 0; | |
4210 | return 1; | |
4211 | } | |
4212 | ||
7984d532 PA |
4213 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
4214 | If SUSPEND, then also increase the suspend count of every LWP, | |
4215 | except EXCEPT. */ | |
4216 | ||
0d62e5e8 | 4217 | static void |
7984d532 | 4218 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 4219 | { |
bde24c0a PA |
4220 | /* Should not be called recursively. */ |
4221 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
4222 | ||
87ce2a04 DE |
4223 | if (debug_threads) |
4224 | { | |
4225 | debug_enter (); | |
4226 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
4227 | suspend ? "stop-and-suspend" : "stop", | |
4228 | except != NULL | |
d86d4aaf | 4229 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
4230 | : "none"); |
4231 | } | |
4232 | ||
bde24c0a PA |
4233 | stopping_threads = (suspend |
4234 | ? STOPPING_AND_SUSPENDING_THREADS | |
4235 | : STOPPING_THREADS); | |
7984d532 PA |
4236 | |
4237 | if (suspend) | |
d86d4aaf | 4238 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 4239 | else |
d86d4aaf | 4240 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 4241 | wait_for_sigstop (); |
bde24c0a | 4242 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
4243 | |
4244 | if (debug_threads) | |
4245 | { | |
4246 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
4247 | "back to !stopping\n"); | |
4248 | debug_exit (); | |
4249 | } | |
0d62e5e8 DJ |
4250 | } |
4251 | ||
863d01bd PA |
4252 | /* Enqueue one signal in the chain of signals which need to be |
4253 | delivered to this process on next resume. */ | |
4254 | ||
4255 | static void | |
4256 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
4257 | { | |
8d749320 | 4258 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 4259 | |
863d01bd PA |
4260 | p_sig->prev = lwp->pending_signals; |
4261 | p_sig->signal = signal; | |
4262 | if (info == NULL) | |
4263 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4264 | else | |
4265 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
4266 | lwp->pending_signals = p_sig; | |
4267 | } | |
4268 | ||
fa5308bd AT |
4269 | /* Install breakpoints for software single stepping. */ |
4270 | ||
4271 | static void | |
4272 | install_software_single_step_breakpoints (struct lwp_info *lwp) | |
4273 | { | |
984a2c04 YQ |
4274 | struct thread_info *thread = get_lwp_thread (lwp); |
4275 | struct regcache *regcache = get_thread_regcache (thread, 1); | |
984a2c04 YQ |
4276 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); |
4277 | ||
984a2c04 | 4278 | current_thread = thread; |
a0ff9e1a | 4279 | std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache); |
fa5308bd | 4280 | |
a0ff9e1a | 4281 | for (CORE_ADDR pc : next_pcs) |
3b9a79ef | 4282 | set_single_step_breakpoint (pc, current_ptid); |
fa5308bd AT |
4283 | |
4284 | do_cleanups (old_chain); | |
4285 | } | |
4286 | ||
7fe5e27e AT |
4287 | /* Single step via hardware or software single step. |
4288 | Return 1 if hardware single stepping, 0 if software single stepping | |
4289 | or can't single step. */ | |
4290 | ||
4291 | static int | |
4292 | single_step (struct lwp_info* lwp) | |
4293 | { | |
4294 | int step = 0; | |
4295 | ||
4296 | if (can_hardware_single_step ()) | |
4297 | { | |
4298 | step = 1; | |
4299 | } | |
4300 | else if (can_software_single_step ()) | |
4301 | { | |
4302 | install_software_single_step_breakpoints (lwp); | |
4303 | step = 0; | |
4304 | } | |
4305 | else | |
4306 | { | |
4307 | if (debug_threads) | |
4308 | debug_printf ("stepping is not implemented on this target"); | |
4309 | } | |
4310 | ||
4311 | return step; | |
4312 | } | |
4313 | ||
35ac8b3e | 4314 | /* The signal can be delivered to the inferior if we are not trying to |
5b061e98 YQ |
4315 | finish a fast tracepoint collect. Since signal can be delivered in |
4316 | the step-over, the program may go to signal handler and trap again | |
4317 | after return from the signal handler. We can live with the spurious | |
4318 | double traps. */ | |
35ac8b3e YQ |
4319 | |
4320 | static int | |
4321 | lwp_signal_can_be_delivered (struct lwp_info *lwp) | |
4322 | { | |
229d26fc SM |
4323 | return (lwp->collecting_fast_tracepoint |
4324 | == fast_tpoint_collect_result::not_collecting); | |
35ac8b3e YQ |
4325 | } |
4326 | ||
23f238d3 PA |
4327 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
4328 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 4329 | |
ce3a066d | 4330 | static void |
23f238d3 PA |
4331 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
4332 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 4333 | { |
d86d4aaf | 4334 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4335 | struct thread_info *saved_thread; |
82075af2 | 4336 | int ptrace_request; |
c06cbd92 YQ |
4337 | struct process_info *proc = get_thread_process (thread); |
4338 | ||
4339 | /* Note that target description may not be initialised | |
4340 | (proc->tdesc == NULL) at this point because the program hasn't | |
4341 | stopped at the first instruction yet. It means GDBserver skips | |
4342 | the extra traps from the wrapper program (see option --wrapper). | |
4343 | Code in this function that requires register access should be | |
4344 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 4345 | |
54a0b537 | 4346 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
4347 | return; |
4348 | ||
65706a29 PA |
4349 | gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE); |
4350 | ||
229d26fc SM |
4351 | fast_tpoint_collect_result fast_tp_collecting |
4352 | = lwp->collecting_fast_tracepoint; | |
fa593d66 | 4353 | |
229d26fc SM |
4354 | gdb_assert (!stabilizing_threads |
4355 | || (fast_tp_collecting | |
4356 | != fast_tpoint_collect_result::not_collecting)); | |
fa593d66 | 4357 | |
219f2f23 PA |
4358 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
4359 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 4360 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
4361 | { |
4362 | /* Collecting 'while-stepping' actions doesn't make sense | |
4363 | anymore. */ | |
d86d4aaf | 4364 | release_while_stepping_state_list (thread); |
219f2f23 PA |
4365 | } |
4366 | ||
0d62e5e8 | 4367 | /* If we have pending signals or status, and a new signal, enqueue the |
35ac8b3e YQ |
4368 | signal. Also enqueue the signal if it can't be delivered to the |
4369 | inferior right now. */ | |
0d62e5e8 | 4370 | if (signal != 0 |
fa593d66 PA |
4371 | && (lwp->status_pending_p |
4372 | || lwp->pending_signals != NULL | |
35ac8b3e | 4373 | || !lwp_signal_can_be_delivered (lwp))) |
94610ec4 YQ |
4374 | { |
4375 | enqueue_pending_signal (lwp, signal, info); | |
4376 | ||
4377 | /* Postpone any pending signal. It was enqueued above. */ | |
4378 | signal = 0; | |
4379 | } | |
0d62e5e8 | 4380 | |
d50171e4 PA |
4381 | if (lwp->status_pending_p) |
4382 | { | |
4383 | if (debug_threads) | |
94610ec4 | 4384 | debug_printf ("Not resuming lwp %ld (%s, stop %s);" |
87ce2a04 | 4385 | " has pending status\n", |
94610ec4 | 4386 | lwpid_of (thread), step ? "step" : "continue", |
87ce2a04 | 4387 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
4388 | return; |
4389 | } | |
0d62e5e8 | 4390 | |
0bfdf32f GB |
4391 | saved_thread = current_thread; |
4392 | current_thread = thread; | |
0d62e5e8 | 4393 | |
0d62e5e8 DJ |
4394 | /* This bit needs some thinking about. If we get a signal that |
4395 | we must report while a single-step reinsert is still pending, | |
4396 | we often end up resuming the thread. It might be better to | |
4397 | (ew) allow a stack of pending events; then we could be sure that | |
4398 | the reinsert happened right away and not lose any signals. | |
4399 | ||
4400 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 4401 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
4402 | complete correctness, so it won't solve that problem. It may be |
4403 | worthwhile just to solve this one, however. */ | |
54a0b537 | 4404 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
4405 | { |
4406 | if (debug_threads) | |
87ce2a04 DE |
4407 | debug_printf (" pending reinsert at 0x%s\n", |
4408 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 4409 | |
85e00e85 | 4410 | if (can_hardware_single_step ()) |
d50171e4 | 4411 | { |
229d26fc | 4412 | if (fast_tp_collecting == fast_tpoint_collect_result::not_collecting) |
fa593d66 PA |
4413 | { |
4414 | if (step == 0) | |
9986ba08 | 4415 | warning ("BAD - reinserting but not stepping."); |
fa593d66 | 4416 | if (lwp->suspended) |
9986ba08 PA |
4417 | warning ("BAD - reinserting and suspended(%d).", |
4418 | lwp->suspended); | |
fa593d66 | 4419 | } |
d50171e4 | 4420 | } |
f79b145d YQ |
4421 | |
4422 | step = maybe_hw_step (thread); | |
0d62e5e8 DJ |
4423 | } |
4424 | ||
229d26fc | 4425 | if (fast_tp_collecting == fast_tpoint_collect_result::before_insn) |
fa593d66 PA |
4426 | { |
4427 | if (debug_threads) | |
87ce2a04 DE |
4428 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4429 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 4430 | lwpid_of (thread)); |
fa593d66 | 4431 | } |
229d26fc | 4432 | else if (fast_tp_collecting == fast_tpoint_collect_result::at_insn) |
fa593d66 PA |
4433 | { |
4434 | if (debug_threads) | |
87ce2a04 DE |
4435 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
4436 | " single-stepping\n", | |
d86d4aaf | 4437 | lwpid_of (thread)); |
fa593d66 PA |
4438 | |
4439 | if (can_hardware_single_step ()) | |
4440 | step = 1; | |
4441 | else | |
38e08fca GB |
4442 | { |
4443 | internal_error (__FILE__, __LINE__, | |
4444 | "moving out of jump pad single-stepping" | |
4445 | " not implemented on this target"); | |
4446 | } | |
fa593d66 PA |
4447 | } |
4448 | ||
219f2f23 PA |
4449 | /* If we have while-stepping actions in this thread set it stepping. |
4450 | If we have a signal to deliver, it may or may not be set to | |
4451 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4452 | while-stepping into a signal handler. A possible smart thing to | |
4453 | do would be to set an internal breakpoint at the signal return | |
4454 | address, continue, and carry on catching this while-stepping | |
4455 | action only when that breakpoint is hit. A future | |
4456 | enhancement. */ | |
7fe5e27e | 4457 | if (thread->while_stepping != NULL) |
219f2f23 PA |
4458 | { |
4459 | if (debug_threads) | |
87ce2a04 | 4460 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4461 | lwpid_of (thread)); |
7fe5e27e AT |
4462 | |
4463 | step = single_step (lwp); | |
219f2f23 PA |
4464 | } |
4465 | ||
c06cbd92 | 4466 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4467 | { |
0bfdf32f | 4468 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4469 | |
4470 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4471 | ||
4472 | if (debug_threads) | |
4473 | { | |
4474 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4475 | (long) lwp->stop_pc); | |
4476 | } | |
0d62e5e8 DJ |
4477 | } |
4478 | ||
35ac8b3e YQ |
4479 | /* If we have pending signals, consume one if it can be delivered to |
4480 | the inferior. */ | |
4481 | if (lwp->pending_signals != NULL && lwp_signal_can_be_delivered (lwp)) | |
0d62e5e8 DJ |
4482 | { |
4483 | struct pending_signals **p_sig; | |
4484 | ||
54a0b537 | 4485 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4486 | while ((*p_sig)->prev != NULL) |
4487 | p_sig = &(*p_sig)->prev; | |
4488 | ||
4489 | signal = (*p_sig)->signal; | |
32ca6d61 | 4490 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4491 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4492 | &(*p_sig)->info); |
32ca6d61 | 4493 | |
0d62e5e8 DJ |
4494 | free (*p_sig); |
4495 | *p_sig = NULL; | |
4496 | } | |
4497 | ||
94610ec4 YQ |
4498 | if (debug_threads) |
4499 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", | |
4500 | lwpid_of (thread), step ? "step" : "continue", signal, | |
4501 | lwp->stop_expected ? "expected" : "not expected"); | |
4502 | ||
aa5ca48f DE |
4503 | if (the_low_target.prepare_to_resume != NULL) |
4504 | the_low_target.prepare_to_resume (lwp); | |
4505 | ||
d86d4aaf | 4506 | regcache_invalidate_thread (thread); |
da6d8c04 | 4507 | errno = 0; |
54a0b537 | 4508 | lwp->stepping = step; |
82075af2 JS |
4509 | if (step) |
4510 | ptrace_request = PTRACE_SINGLESTEP; | |
4511 | else if (gdb_catching_syscalls_p (lwp)) | |
4512 | ptrace_request = PTRACE_SYSCALL; | |
4513 | else | |
4514 | ptrace_request = PTRACE_CONT; | |
4515 | ptrace (ptrace_request, | |
4516 | lwpid_of (thread), | |
b8e1b30e | 4517 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4518 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4519 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4520 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4521 | |
0bfdf32f | 4522 | current_thread = saved_thread; |
da6d8c04 | 4523 | if (errno) |
23f238d3 PA |
4524 | perror_with_name ("resuming thread"); |
4525 | ||
4526 | /* Successfully resumed. Clear state that no longer makes sense, | |
4527 | and mark the LWP as running. Must not do this before resuming | |
4528 | otherwise if that fails other code will be confused. E.g., we'd | |
4529 | later try to stop the LWP and hang forever waiting for a stop | |
4530 | status. Note that we must not throw after this is cleared, | |
4531 | otherwise handle_zombie_lwp_error would get confused. */ | |
4532 | lwp->stopped = 0; | |
4533 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4534 | } | |
4535 | ||
4536 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4537 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4538 | or about to become), discard the error, clear any pending status | |
4539 | the LWP may have, and return true (we'll collect the exit status | |
4540 | soon enough). Otherwise, return false. */ | |
4541 | ||
4542 | static int | |
4543 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4544 | { | |
4545 | struct thread_info *thread = get_lwp_thread (lp); | |
4546 | ||
4547 | /* If we get an error after resuming the LWP successfully, we'd | |
4548 | confuse !T state for the LWP being gone. */ | |
4549 | gdb_assert (lp->stopped); | |
4550 | ||
4551 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4552 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4553 | yet fully dead", but already refusing ptrace requests. In that | |
4554 | case the tracee has 'R (Running)' state for a little bit | |
4555 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4556 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4557 | other than ptrace-stopped. */ | |
4558 | ||
4559 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4560 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4561 | { |
23f238d3 PA |
4562 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4563 | lp->status_pending_p = 0; | |
4564 | return 1; | |
4565 | } | |
4566 | return 0; | |
4567 | } | |
4568 | ||
4569 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4570 | disappears while we try to resume it. */ | |
3221518c | 4571 | |
23f238d3 PA |
4572 | static void |
4573 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4574 | int step, int signal, siginfo_t *info) | |
4575 | { | |
4576 | TRY | |
4577 | { | |
4578 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4579 | } | |
4580 | CATCH (ex, RETURN_MASK_ERROR) | |
4581 | { | |
4582 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4583 | throw_exception (ex); | |
3221518c | 4584 | } |
23f238d3 | 4585 | END_CATCH |
da6d8c04 DJ |
4586 | } |
4587 | ||
2bd7c093 PA |
4588 | struct thread_resume_array |
4589 | { | |
4590 | struct thread_resume *resume; | |
4591 | size_t n; | |
4592 | }; | |
64386c31 | 4593 | |
ebcf782c DE |
4594 | /* This function is called once per thread via find_inferior. |
4595 | ARG is a pointer to a thread_resume_array struct. | |
4596 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4597 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4598 | |
4599 | This algorithm is O(threads * resume elements), but resume elements | |
4600 | is small (and will remain small at least until GDB supports thread | |
4601 | suspension). */ | |
ebcf782c | 4602 | |
2bd7c093 | 4603 | static int |
9c80ecd6 | 4604 | linux_set_resume_request (thread_info *thread, void *arg) |
0d62e5e8 | 4605 | { |
d86d4aaf | 4606 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4607 | int ndx; |
2bd7c093 | 4608 | struct thread_resume_array *r; |
64386c31 | 4609 | |
9a3c8263 | 4610 | r = (struct thread_resume_array *) arg; |
64386c31 | 4611 | |
2bd7c093 | 4612 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4613 | { |
4614 | ptid_t ptid = r->resume[ndx].thread; | |
4615 | if (ptid_equal (ptid, minus_one_ptid) | |
9c80ecd6 | 4616 | || ptid == thread->id |
0c9070b3 YQ |
4617 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4618 | of PID'. */ | |
d86d4aaf | 4619 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4620 | && (ptid_is_pid (ptid) |
4621 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4622 | { |
d50171e4 | 4623 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4624 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4625 | { |
4626 | if (debug_threads) | |
87ce2a04 DE |
4627 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4628 | (thread->last_status.kind | |
4629 | == TARGET_WAITKIND_STOPPED) | |
4630 | ? "stopped" | |
4631 | : "stopping", | |
d86d4aaf | 4632 | lwpid_of (thread)); |
d50171e4 PA |
4633 | |
4634 | continue; | |
4635 | } | |
4636 | ||
5a04c4cf PA |
4637 | /* Ignore (wildcard) resume requests for already-resumed |
4638 | threads. */ | |
4639 | if (r->resume[ndx].kind != resume_stop | |
4640 | && thread->last_resume_kind != resume_stop) | |
4641 | { | |
4642 | if (debug_threads) | |
4643 | debug_printf ("already %s LWP %ld at GDB's request\n", | |
4644 | (thread->last_resume_kind | |
4645 | == resume_step) | |
4646 | ? "stepping" | |
4647 | : "continuing", | |
4648 | lwpid_of (thread)); | |
4649 | continue; | |
4650 | } | |
4651 | ||
4652 | /* Don't let wildcard resumes resume fork children that GDB | |
4653 | does not yet know are new fork children. */ | |
4654 | if (lwp->fork_relative != NULL) | |
4655 | { | |
5a04c4cf PA |
4656 | struct lwp_info *rel = lwp->fork_relative; |
4657 | ||
4658 | if (rel->status_pending_p | |
4659 | && (rel->waitstatus.kind == TARGET_WAITKIND_FORKED | |
4660 | || rel->waitstatus.kind == TARGET_WAITKIND_VFORKED)) | |
4661 | { | |
4662 | if (debug_threads) | |
4663 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4664 | lwpid_of (thread)); | |
4665 | continue; | |
4666 | } | |
4667 | } | |
4668 | ||
4669 | /* If the thread has a pending event that has already been | |
4670 | reported to GDBserver core, but GDB has not pulled the | |
4671 | event out of the vStopped queue yet, likewise, ignore the | |
4672 | (wildcard) resume request. */ | |
9c80ecd6 | 4673 | if (in_queued_stop_replies (thread->id)) |
5a04c4cf PA |
4674 | { |
4675 | if (debug_threads) | |
4676 | debug_printf ("not resuming LWP %ld: has queued stop reply\n", | |
4677 | lwpid_of (thread)); | |
4678 | continue; | |
4679 | } | |
4680 | ||
95954743 | 4681 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4682 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4683 | |
c2d6af84 PA |
4684 | lwp->step_range_start = lwp->resume->step_range_start; |
4685 | lwp->step_range_end = lwp->resume->step_range_end; | |
4686 | ||
fa593d66 PA |
4687 | /* If we had a deferred signal to report, dequeue one now. |
4688 | This can happen if LWP gets more than one signal while | |
4689 | trying to get out of a jump pad. */ | |
4690 | if (lwp->stopped | |
4691 | && !lwp->status_pending_p | |
4692 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4693 | { | |
4694 | lwp->status_pending_p = 1; | |
4695 | ||
4696 | if (debug_threads) | |
87ce2a04 DE |
4697 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4698 | "leaving status pending.\n", | |
d86d4aaf DE |
4699 | WSTOPSIG (lwp->status_pending), |
4700 | lwpid_of (thread)); | |
fa593d66 PA |
4701 | } |
4702 | ||
95954743 PA |
4703 | return 0; |
4704 | } | |
4705 | } | |
2bd7c093 PA |
4706 | |
4707 | /* No resume action for this thread. */ | |
4708 | lwp->resume = NULL; | |
64386c31 | 4709 | |
2bd7c093 | 4710 | return 0; |
5544ad89 DJ |
4711 | } |
4712 | ||
20ad9378 DE |
4713 | /* find_inferior callback for linux_resume. |
4714 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4715 | |
bd99dc85 | 4716 | static int |
9c80ecd6 | 4717 | resume_status_pending_p (thread_info *thread, void *flag_p) |
5544ad89 | 4718 | { |
d86d4aaf | 4719 | struct lwp_info *lwp = get_thread_lwp (thread); |
5544ad89 | 4720 | |
bd99dc85 PA |
4721 | /* LWPs which will not be resumed are not interesting, because |
4722 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4723 | if (lwp->resume == NULL) |
bd99dc85 | 4724 | return 0; |
64386c31 | 4725 | |
582511be | 4726 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4727 | * (int *) flag_p = 1; |
4728 | ||
4729 | return 0; | |
4730 | } | |
4731 | ||
4732 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4733 | internal breakpoint that we need to step over. It assumes that any | |
4734 | required STOP_PC adjustment has already been propagated to the | |
4735 | inferior's regcache. */ | |
4736 | ||
4737 | static int | |
9c80ecd6 | 4738 | need_step_over_p (thread_info *thread, void *dummy) |
d50171e4 | 4739 | { |
d86d4aaf | 4740 | struct lwp_info *lwp = get_thread_lwp (thread); |
0bfdf32f | 4741 | struct thread_info *saved_thread; |
d50171e4 | 4742 | CORE_ADDR pc; |
c06cbd92 YQ |
4743 | struct process_info *proc = get_thread_process (thread); |
4744 | ||
4745 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4746 | don't have to do step over. */ | |
4747 | if (proc->tdesc == NULL) | |
4748 | return 0; | |
d50171e4 PA |
4749 | |
4750 | /* LWPs which will not be resumed are not interesting, because we | |
4751 | might not wait for them next time through linux_wait. */ | |
4752 | ||
4753 | if (!lwp->stopped) | |
4754 | { | |
4755 | if (debug_threads) | |
87ce2a04 | 4756 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4757 | lwpid_of (thread)); |
d50171e4 PA |
4758 | return 0; |
4759 | } | |
4760 | ||
8336d594 | 4761 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4762 | { |
4763 | if (debug_threads) | |
87ce2a04 DE |
4764 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4765 | " stopped\n", | |
d86d4aaf | 4766 | lwpid_of (thread)); |
d50171e4 PA |
4767 | return 0; |
4768 | } | |
4769 | ||
7984d532 PA |
4770 | gdb_assert (lwp->suspended >= 0); |
4771 | ||
4772 | if (lwp->suspended) | |
4773 | { | |
4774 | if (debug_threads) | |
87ce2a04 | 4775 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4776 | lwpid_of (thread)); |
7984d532 PA |
4777 | return 0; |
4778 | } | |
4779 | ||
bd99dc85 | 4780 | if (lwp->status_pending_p) |
d50171e4 PA |
4781 | { |
4782 | if (debug_threads) | |
87ce2a04 DE |
4783 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4784 | " status.\n", | |
d86d4aaf | 4785 | lwpid_of (thread)); |
d50171e4 PA |
4786 | return 0; |
4787 | } | |
4788 | ||
4789 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4790 | or we have. */ | |
4791 | pc = get_pc (lwp); | |
4792 | ||
4793 | /* If the PC has changed since we stopped, then don't do anything, | |
4794 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4795 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4796 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4797 | command, or poked thread's registers herself. */ | |
4798 | if (pc != lwp->stop_pc) | |
4799 | { | |
4800 | if (debug_threads) | |
87ce2a04 DE |
4801 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4802 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4803 | lwpid_of (thread), |
4804 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4805 | return 0; |
4806 | } | |
4807 | ||
484b3c32 YQ |
4808 | /* On software single step target, resume the inferior with signal |
4809 | rather than stepping over. */ | |
4810 | if (can_software_single_step () | |
4811 | && lwp->pending_signals != NULL | |
4812 | && lwp_signal_can_be_delivered (lwp)) | |
4813 | { | |
4814 | if (debug_threads) | |
4815 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" | |
4816 | " signals.\n", | |
4817 | lwpid_of (thread)); | |
4818 | ||
4819 | return 0; | |
4820 | } | |
4821 | ||
0bfdf32f GB |
4822 | saved_thread = current_thread; |
4823 | current_thread = thread; | |
d50171e4 | 4824 | |
8b07ae33 | 4825 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4826 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4827 | { |
8b07ae33 | 4828 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4829 | though. If the condition is being evaluated on the target's side |
4830 | and it evaluate to false, step over this breakpoint as well. */ | |
4831 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4832 | && gdb_condition_true_at_breakpoint (pc) |
4833 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4834 | { |
4835 | if (debug_threads) | |
87ce2a04 DE |
4836 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4837 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4838 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4839 | |
0bfdf32f | 4840 | current_thread = saved_thread; |
8b07ae33 PA |
4841 | return 0; |
4842 | } | |
4843 | else | |
4844 | { | |
4845 | if (debug_threads) | |
87ce2a04 DE |
4846 | debug_printf ("Need step over [LWP %ld]? yes, " |
4847 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4848 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4849 | |
8b07ae33 PA |
4850 | /* We've found an lwp that needs stepping over --- return 1 so |
4851 | that find_inferior stops looking. */ | |
0bfdf32f | 4852 | current_thread = saved_thread; |
8b07ae33 | 4853 | |
8b07ae33 PA |
4854 | return 1; |
4855 | } | |
d50171e4 PA |
4856 | } |
4857 | ||
0bfdf32f | 4858 | current_thread = saved_thread; |
d50171e4 PA |
4859 | |
4860 | if (debug_threads) | |
87ce2a04 DE |
4861 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4862 | " at 0x%s\n", | |
d86d4aaf | 4863 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4864 | |
bd99dc85 | 4865 | return 0; |
5544ad89 DJ |
4866 | } |
4867 | ||
d50171e4 PA |
4868 | /* Start a step-over operation on LWP. When LWP stopped at a |
4869 | breakpoint, to make progress, we need to remove the breakpoint out | |
4870 | of the way. If we let other threads run while we do that, they may | |
4871 | pass by the breakpoint location and miss hitting it. To avoid | |
4872 | that, a step-over momentarily stops all threads while LWP is | |
c40c8d4b YQ |
4873 | single-stepped by either hardware or software while the breakpoint |
4874 | is temporarily uninserted from the inferior. When the single-step | |
4875 | finishes, we reinsert the breakpoint, and let all threads that are | |
4876 | supposed to be running, run again. */ | |
d50171e4 PA |
4877 | |
4878 | static int | |
4879 | start_step_over (struct lwp_info *lwp) | |
4880 | { | |
d86d4aaf | 4881 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4882 | struct thread_info *saved_thread; |
d50171e4 PA |
4883 | CORE_ADDR pc; |
4884 | int step; | |
4885 | ||
4886 | if (debug_threads) | |
87ce2a04 | 4887 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4888 | lwpid_of (thread)); |
d50171e4 | 4889 | |
7984d532 | 4890 | stop_all_lwps (1, lwp); |
863d01bd PA |
4891 | |
4892 | if (lwp->suspended != 0) | |
4893 | { | |
4894 | internal_error (__FILE__, __LINE__, | |
4895 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4896 | lwp->suspended); | |
4897 | } | |
d50171e4 PA |
4898 | |
4899 | if (debug_threads) | |
87ce2a04 | 4900 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4901 | |
4902 | /* Note, we should always reach here with an already adjusted PC, | |
4903 | either by GDB (if we're resuming due to GDB's request), or by our | |
4904 | caller, if we just finished handling an internal breakpoint GDB | |
4905 | shouldn't care about. */ | |
4906 | pc = get_pc (lwp); | |
4907 | ||
0bfdf32f GB |
4908 | saved_thread = current_thread; |
4909 | current_thread = thread; | |
d50171e4 PA |
4910 | |
4911 | lwp->bp_reinsert = pc; | |
4912 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4913 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 | 4914 | |
7fe5e27e | 4915 | step = single_step (lwp); |
d50171e4 | 4916 | |
0bfdf32f | 4917 | current_thread = saved_thread; |
d50171e4 PA |
4918 | |
4919 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4920 | ||
4921 | /* Require next event from this LWP. */ | |
9c80ecd6 | 4922 | step_over_bkpt = thread->id; |
d50171e4 PA |
4923 | return 1; |
4924 | } | |
4925 | ||
4926 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3b9a79ef | 4927 | start_step_over, if still there, and delete any single-step |
d50171e4 PA |
4928 | breakpoints we've set, on non hardware single-step targets. */ |
4929 | ||
4930 | static int | |
4931 | finish_step_over (struct lwp_info *lwp) | |
4932 | { | |
4933 | if (lwp->bp_reinsert != 0) | |
4934 | { | |
f79b145d YQ |
4935 | struct thread_info *saved_thread = current_thread; |
4936 | ||
d50171e4 | 4937 | if (debug_threads) |
87ce2a04 | 4938 | debug_printf ("Finished step over.\n"); |
d50171e4 | 4939 | |
f79b145d YQ |
4940 | current_thread = get_lwp_thread (lwp); |
4941 | ||
d50171e4 PA |
4942 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there |
4943 | may be no breakpoint to reinsert there by now. */ | |
4944 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4945 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4946 | |
4947 | lwp->bp_reinsert = 0; | |
4948 | ||
3b9a79ef YQ |
4949 | /* Delete any single-step breakpoints. No longer needed. We |
4950 | don't have to worry about other threads hitting this trap, | |
4951 | and later not being able to explain it, because we were | |
4952 | stepping over a breakpoint, and we hold all threads but | |
4953 | LWP stopped while doing that. */ | |
d50171e4 | 4954 | if (!can_hardware_single_step ()) |
f79b145d | 4955 | { |
3b9a79ef YQ |
4956 | gdb_assert (has_single_step_breakpoints (current_thread)); |
4957 | delete_single_step_breakpoints (current_thread); | |
f79b145d | 4958 | } |
d50171e4 PA |
4959 | |
4960 | step_over_bkpt = null_ptid; | |
f79b145d | 4961 | current_thread = saved_thread; |
d50171e4 PA |
4962 | return 1; |
4963 | } | |
4964 | else | |
4965 | return 0; | |
4966 | } | |
4967 | ||
863d01bd PA |
4968 | /* If there's a step over in progress, wait until all threads stop |
4969 | (that is, until the stepping thread finishes its step), and | |
4970 | unsuspend all lwps. The stepping thread ends with its status | |
4971 | pending, which is processed later when we get back to processing | |
4972 | events. */ | |
4973 | ||
4974 | static void | |
4975 | complete_ongoing_step_over (void) | |
4976 | { | |
4977 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
4978 | { | |
4979 | struct lwp_info *lwp; | |
4980 | int wstat; | |
4981 | int ret; | |
4982 | ||
4983 | if (debug_threads) | |
4984 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4985 | ||
4986 | /* Passing NULL_PTID as filter indicates we want all events to | |
4987 | be left pending. Eventually this returns when there are no | |
4988 | unwaited-for children left. */ | |
4989 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4990 | &wstat, __WALL); | |
4991 | gdb_assert (ret == -1); | |
4992 | ||
4993 | lwp = find_lwp_pid (step_over_bkpt); | |
4994 | if (lwp != NULL) | |
4995 | finish_step_over (lwp); | |
4996 | step_over_bkpt = null_ptid; | |
4997 | unsuspend_all_lwps (lwp); | |
4998 | } | |
4999 | } | |
5000 | ||
5544ad89 DJ |
5001 | /* This function is called once per thread. We check the thread's resume |
5002 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 5003 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 5004 | |
bd99dc85 PA |
5005 | For threads which we aren't explicitly told otherwise, we preserve |
5006 | the stepping flag; this is used for stepping over gdbserver-placed | |
5007 | breakpoints. | |
5008 | ||
5009 | If pending_flags was set in any thread, we queue any needed | |
5010 | signals, since we won't actually resume. We already have a pending | |
5011 | event to report, so we don't need to preserve any step requests; | |
5012 | they should be re-issued if necessary. */ | |
5013 | ||
5014 | static int | |
9c80ecd6 | 5015 | linux_resume_one_thread (thread_info *thread, void *arg) |
5544ad89 | 5016 | { |
d86d4aaf | 5017 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
5018 | int leave_all_stopped = * (int *) arg; |
5019 | int leave_pending; | |
5544ad89 | 5020 | |
2bd7c093 | 5021 | if (lwp->resume == NULL) |
bd99dc85 | 5022 | return 0; |
5544ad89 | 5023 | |
bd99dc85 | 5024 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 5025 | { |
bd99dc85 | 5026 | if (debug_threads) |
d86d4aaf | 5027 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
5028 | |
5029 | if (!lwp->stopped) | |
5030 | { | |
5031 | if (debug_threads) | |
d86d4aaf | 5032 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 5033 | |
d50171e4 PA |
5034 | /* Stop the thread, and wait for the event asynchronously, |
5035 | through the event loop. */ | |
02fc4de7 | 5036 | send_sigstop (lwp); |
bd99dc85 PA |
5037 | } |
5038 | else | |
5039 | { | |
5040 | if (debug_threads) | |
87ce2a04 | 5041 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 5042 | lwpid_of (thread)); |
d50171e4 PA |
5043 | |
5044 | /* The LWP may have been stopped in an internal event that | |
5045 | was not meant to be notified back to GDB (e.g., gdbserver | |
5046 | breakpoint), so we should be reporting a stop event in | |
5047 | this case too. */ | |
5048 | ||
5049 | /* If the thread already has a pending SIGSTOP, this is a | |
5050 | no-op. Otherwise, something later will presumably resume | |
5051 | the thread and this will cause it to cancel any pending | |
5052 | operation, due to last_resume_kind == resume_stop. If | |
5053 | the thread already has a pending status to report, we | |
5054 | will still report it the next time we wait - see | |
5055 | status_pending_p_callback. */ | |
1a981360 PA |
5056 | |
5057 | /* If we already have a pending signal to report, then | |
5058 | there's no need to queue a SIGSTOP, as this means we're | |
5059 | midway through moving the LWP out of the jumppad, and we | |
5060 | will report the pending signal as soon as that is | |
5061 | finished. */ | |
5062 | if (lwp->pending_signals_to_report == NULL) | |
5063 | send_sigstop (lwp); | |
bd99dc85 | 5064 | } |
32ca6d61 | 5065 | |
bd99dc85 PA |
5066 | /* For stop requests, we're done. */ |
5067 | lwp->resume = NULL; | |
fc7238bb | 5068 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5069 | return 0; |
5544ad89 DJ |
5070 | } |
5071 | ||
bd99dc85 | 5072 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
5073 | then don't resume it - we can just report the pending status. |
5074 | Likewise if it is suspended, because e.g., another thread is | |
5075 | stepping past a breakpoint. Make sure to queue any signals that | |
5076 | would otherwise be sent. In all-stop mode, we do this decision | |
5077 | based on if *any* thread has a pending status. If there's a | |
5078 | thread that needs the step-over-breakpoint dance, then don't | |
5079 | resume any other thread but that particular one. */ | |
5080 | leave_pending = (lwp->suspended | |
5081 | || lwp->status_pending_p | |
5082 | || leave_all_stopped); | |
5544ad89 | 5083 | |
0e9a339e YQ |
5084 | /* If we have a new signal, enqueue the signal. */ |
5085 | if (lwp->resume->sig != 0) | |
5086 | { | |
5087 | siginfo_t info, *info_p; | |
5088 | ||
5089 | /* If this is the same signal we were previously stopped by, | |
5090 | make sure to queue its siginfo. */ | |
5091 | if (WIFSTOPPED (lwp->last_status) | |
5092 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig | |
5093 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), | |
5094 | (PTRACE_TYPE_ARG3) 0, &info) == 0) | |
5095 | info_p = &info; | |
5096 | else | |
5097 | info_p = NULL; | |
5098 | ||
5099 | enqueue_pending_signal (lwp, lwp->resume->sig, info_p); | |
5100 | } | |
5101 | ||
d50171e4 | 5102 | if (!leave_pending) |
bd99dc85 PA |
5103 | { |
5104 | if (debug_threads) | |
d86d4aaf | 5105 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 5106 | |
9c80ecd6 | 5107 | proceed_one_lwp (thread, NULL); |
bd99dc85 PA |
5108 | } |
5109 | else | |
5110 | { | |
5111 | if (debug_threads) | |
d86d4aaf | 5112 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
bd99dc85 | 5113 | } |
5544ad89 | 5114 | |
fc7238bb | 5115 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 5116 | lwp->resume = NULL; |
5544ad89 | 5117 | return 0; |
0d62e5e8 DJ |
5118 | } |
5119 | ||
5120 | static void | |
2bd7c093 | 5121 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 5122 | { |
2bd7c093 | 5123 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 5124 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
5125 | int any_pending; |
5126 | int leave_all_stopped; | |
c6ecbae5 | 5127 | |
87ce2a04 DE |
5128 | if (debug_threads) |
5129 | { | |
5130 | debug_enter (); | |
5131 | debug_printf ("linux_resume:\n"); | |
5132 | } | |
5133 | ||
2bd7c093 | 5134 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 5135 | |
d50171e4 PA |
5136 | /* If there is a thread which would otherwise be resumed, which has |
5137 | a pending status, then don't resume any threads - we can just | |
5138 | report the pending status. Make sure to queue any signals that | |
5139 | would otherwise be sent. In non-stop mode, we'll apply this | |
5140 | logic to each thread individually. We consume all pending events | |
5141 | before considering to start a step-over (in all-stop). */ | |
5142 | any_pending = 0; | |
bd99dc85 | 5143 | if (!non_stop) |
d86d4aaf | 5144 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
5145 | |
5146 | /* If there is a thread which would otherwise be resumed, which is | |
5147 | stopped at a breakpoint that needs stepping over, then don't | |
5148 | resume any threads - have it step over the breakpoint with all | |
5149 | other threads stopped, then resume all threads again. Make sure | |
5150 | to queue any signals that would otherwise be delivered or | |
5151 | queued. */ | |
5152 | if (!any_pending && supports_breakpoints ()) | |
5153 | need_step_over | |
d86d4aaf DE |
5154 | = (struct thread_info *) find_inferior (&all_threads, |
5155 | need_step_over_p, NULL); | |
d50171e4 PA |
5156 | |
5157 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
5158 | ||
5159 | if (debug_threads) | |
5160 | { | |
5161 | if (need_step_over != NULL) | |
87ce2a04 | 5162 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 5163 | else if (any_pending) |
87ce2a04 DE |
5164 | debug_printf ("Not resuming, all-stop and found " |
5165 | "an LWP with pending status\n"); | |
d50171e4 | 5166 | else |
87ce2a04 | 5167 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
5168 | } |
5169 | ||
5170 | /* Even if we're leaving threads stopped, queue all signals we'd | |
5171 | otherwise deliver. */ | |
5172 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
5173 | ||
5174 | if (need_step_over) | |
d86d4aaf | 5175 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
5176 | |
5177 | if (debug_threads) | |
5178 | { | |
5179 | debug_printf ("linux_resume done\n"); | |
5180 | debug_exit (); | |
5181 | } | |
1bebeeca PA |
5182 | |
5183 | /* We may have events that were pending that can/should be sent to | |
5184 | the client now. Trigger a linux_wait call. */ | |
5185 | if (target_is_async_p ()) | |
5186 | async_file_mark (); | |
d50171e4 PA |
5187 | } |
5188 | ||
5189 | /* This function is called once per thread. We check the thread's | |
5190 | last resume request, which will tell us whether to resume, step, or | |
5191 | leave the thread stopped. Any signal the client requested to be | |
5192 | delivered has already been enqueued at this point. | |
5193 | ||
5194 | If any thread that GDB wants running is stopped at an internal | |
5195 | breakpoint that needs stepping over, we start a step-over operation | |
5196 | on that particular thread, and leave all others stopped. */ | |
5197 | ||
7984d532 | 5198 | static int |
9c80ecd6 | 5199 | proceed_one_lwp (thread_info *thread, void *except) |
d50171e4 | 5200 | { |
d86d4aaf | 5201 | struct lwp_info *lwp = get_thread_lwp (thread); |
d50171e4 PA |
5202 | int step; |
5203 | ||
7984d532 PA |
5204 | if (lwp == except) |
5205 | return 0; | |
d50171e4 PA |
5206 | |
5207 | if (debug_threads) | |
d86d4aaf | 5208 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
5209 | |
5210 | if (!lwp->stopped) | |
5211 | { | |
5212 | if (debug_threads) | |
d86d4aaf | 5213 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 5214 | return 0; |
d50171e4 PA |
5215 | } |
5216 | ||
02fc4de7 PA |
5217 | if (thread->last_resume_kind == resume_stop |
5218 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
5219 | { |
5220 | if (debug_threads) | |
87ce2a04 | 5221 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 5222 | lwpid_of (thread)); |
7984d532 | 5223 | return 0; |
d50171e4 PA |
5224 | } |
5225 | ||
5226 | if (lwp->status_pending_p) | |
5227 | { | |
5228 | if (debug_threads) | |
87ce2a04 | 5229 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 5230 | lwpid_of (thread)); |
7984d532 | 5231 | return 0; |
d50171e4 PA |
5232 | } |
5233 | ||
7984d532 PA |
5234 | gdb_assert (lwp->suspended >= 0); |
5235 | ||
d50171e4 PA |
5236 | if (lwp->suspended) |
5237 | { | |
5238 | if (debug_threads) | |
d86d4aaf | 5239 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 5240 | return 0; |
d50171e4 PA |
5241 | } |
5242 | ||
1a981360 PA |
5243 | if (thread->last_resume_kind == resume_stop |
5244 | && lwp->pending_signals_to_report == NULL | |
229d26fc SM |
5245 | && (lwp->collecting_fast_tracepoint |
5246 | == fast_tpoint_collect_result::not_collecting)) | |
02fc4de7 PA |
5247 | { |
5248 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
5249 | last_status.kind check above would catch it, and we wouldn't | |
5250 | reach here. This LWP may have been momentarily paused by a | |
5251 | stop_all_lwps call while handling for example, another LWP's | |
5252 | step-over. In that case, the pending expected SIGSTOP signal | |
5253 | that was queued at vCont;t handling time will have already | |
5254 | been consumed by wait_for_sigstop, and so we need to requeue | |
5255 | another one here. Note that if the LWP already has a SIGSTOP | |
5256 | pending, this is a no-op. */ | |
5257 | ||
5258 | if (debug_threads) | |
87ce2a04 DE |
5259 | debug_printf ("Client wants LWP %ld to stop. " |
5260 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 5261 | lwpid_of (thread)); |
02fc4de7 PA |
5262 | |
5263 | send_sigstop (lwp); | |
5264 | } | |
5265 | ||
863d01bd PA |
5266 | if (thread->last_resume_kind == resume_step) |
5267 | { | |
5268 | if (debug_threads) | |
5269 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
5270 | lwpid_of (thread)); | |
8901d193 | 5271 | |
3b9a79ef | 5272 | /* If resume_step is requested by GDB, install single-step |
8901d193 | 5273 | breakpoints when the thread is about to be actually resumed if |
3b9a79ef YQ |
5274 | the single-step breakpoints weren't removed. */ |
5275 | if (can_software_single_step () | |
5276 | && !has_single_step_breakpoints (thread)) | |
8901d193 YQ |
5277 | install_software_single_step_breakpoints (lwp); |
5278 | ||
5279 | step = maybe_hw_step (thread); | |
863d01bd PA |
5280 | } |
5281 | else if (lwp->bp_reinsert != 0) | |
5282 | { | |
5283 | if (debug_threads) | |
5284 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
5285 | lwpid_of (thread)); | |
f79b145d YQ |
5286 | |
5287 | step = maybe_hw_step (thread); | |
863d01bd PA |
5288 | } |
5289 | else | |
5290 | step = 0; | |
5291 | ||
d50171e4 | 5292 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
5293 | return 0; |
5294 | } | |
5295 | ||
5296 | static int | |
9c80ecd6 | 5297 | unsuspend_and_proceed_one_lwp (thread_info *thread, void *except) |
7984d532 | 5298 | { |
d86d4aaf | 5299 | struct lwp_info *lwp = get_thread_lwp (thread); |
7984d532 PA |
5300 | |
5301 | if (lwp == except) | |
5302 | return 0; | |
5303 | ||
863d01bd | 5304 | lwp_suspended_decr (lwp); |
7984d532 | 5305 | |
9c80ecd6 | 5306 | return proceed_one_lwp (thread, except); |
d50171e4 PA |
5307 | } |
5308 | ||
5309 | /* When we finish a step-over, set threads running again. If there's | |
5310 | another thread that may need a step-over, now's the time to start | |
5311 | it. Eventually, we'll move all threads past their breakpoints. */ | |
5312 | ||
5313 | static void | |
5314 | proceed_all_lwps (void) | |
5315 | { | |
d86d4aaf | 5316 | struct thread_info *need_step_over; |
d50171e4 PA |
5317 | |
5318 | /* If there is a thread which would otherwise be resumed, which is | |
5319 | stopped at a breakpoint that needs stepping over, then don't | |
5320 | resume any threads - have it step over the breakpoint with all | |
5321 | other threads stopped, then resume all threads again. */ | |
5322 | ||
5323 | if (supports_breakpoints ()) | |
5324 | { | |
5325 | need_step_over | |
d86d4aaf DE |
5326 | = (struct thread_info *) find_inferior (&all_threads, |
5327 | need_step_over_p, NULL); | |
d50171e4 PA |
5328 | |
5329 | if (need_step_over != NULL) | |
5330 | { | |
5331 | if (debug_threads) | |
87ce2a04 DE |
5332 | debug_printf ("proceed_all_lwps: found " |
5333 | "thread %ld needing a step-over\n", | |
5334 | lwpid_of (need_step_over)); | |
d50171e4 | 5335 | |
d86d4aaf | 5336 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
5337 | return; |
5338 | } | |
5339 | } | |
5544ad89 | 5340 | |
d50171e4 | 5341 | if (debug_threads) |
87ce2a04 | 5342 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 5343 | |
d86d4aaf | 5344 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
5345 | } |
5346 | ||
5347 | /* Stopped LWPs that the client wanted to be running, that don't have | |
5348 | pending statuses, are set to run again, except for EXCEPT, if not | |
5349 | NULL. This undoes a stop_all_lwps call. */ | |
5350 | ||
5351 | static void | |
7984d532 | 5352 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 5353 | { |
5544ad89 DJ |
5354 | if (debug_threads) |
5355 | { | |
87ce2a04 | 5356 | debug_enter (); |
d50171e4 | 5357 | if (except) |
87ce2a04 | 5358 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 5359 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 5360 | else |
87ce2a04 | 5361 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
5362 | } |
5363 | ||
7984d532 | 5364 | if (unsuspend) |
d86d4aaf | 5365 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 5366 | else |
d86d4aaf | 5367 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
5368 | |
5369 | if (debug_threads) | |
5370 | { | |
5371 | debug_printf ("unstop_all_lwps done\n"); | |
5372 | debug_exit (); | |
5373 | } | |
0d62e5e8 DJ |
5374 | } |
5375 | ||
58caa3dc DJ |
5376 | |
5377 | #ifdef HAVE_LINUX_REGSETS | |
5378 | ||
1faeff08 MR |
5379 | #define use_linux_regsets 1 |
5380 | ||
030031ee PA |
5381 | /* Returns true if REGSET has been disabled. */ |
5382 | ||
5383 | static int | |
5384 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
5385 | { | |
5386 | return (info->disabled_regsets != NULL | |
5387 | && info->disabled_regsets[regset - info->regsets]); | |
5388 | } | |
5389 | ||
5390 | /* Disable REGSET. */ | |
5391 | ||
5392 | static void | |
5393 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
5394 | { | |
5395 | int dr_offset; | |
5396 | ||
5397 | dr_offset = regset - info->regsets; | |
5398 | if (info->disabled_regsets == NULL) | |
224c3ddb | 5399 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
5400 | info->disabled_regsets[dr_offset] = 1; |
5401 | } | |
5402 | ||
58caa3dc | 5403 | static int |
3aee8918 PA |
5404 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
5405 | struct regcache *regcache) | |
58caa3dc DJ |
5406 | { |
5407 | struct regset_info *regset; | |
e9d25b98 | 5408 | int saw_general_regs = 0; |
95954743 | 5409 | int pid; |
1570b33e | 5410 | struct iovec iov; |
58caa3dc | 5411 | |
0bfdf32f | 5412 | pid = lwpid_of (current_thread); |
28eef672 | 5413 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5414 | { |
1570b33e L |
5415 | void *buf, *data; |
5416 | int nt_type, res; | |
58caa3dc | 5417 | |
030031ee | 5418 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 5419 | continue; |
58caa3dc | 5420 | |
bca929d3 | 5421 | buf = xmalloc (regset->size); |
1570b33e L |
5422 | |
5423 | nt_type = regset->nt_type; | |
5424 | if (nt_type) | |
5425 | { | |
5426 | iov.iov_base = buf; | |
5427 | iov.iov_len = regset->size; | |
5428 | data = (void *) &iov; | |
5429 | } | |
5430 | else | |
5431 | data = buf; | |
5432 | ||
dfb64f85 | 5433 | #ifndef __sparc__ |
f15f9948 | 5434 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5435 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5436 | #else |
1570b33e | 5437 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5438 | #endif |
58caa3dc DJ |
5439 | if (res < 0) |
5440 | { | |
5441 | if (errno == EIO) | |
5442 | { | |
52fa2412 | 5443 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5444 | this process mode. */ |
030031ee | 5445 | disable_regset (regsets_info, regset); |
58caa3dc | 5446 | } |
e5a9158d AA |
5447 | else if (errno == ENODATA) |
5448 | { | |
5449 | /* ENODATA may be returned if the regset is currently | |
5450 | not "active". This can happen in normal operation, | |
5451 | so suppress the warning in this case. */ | |
5452 | } | |
fcd4a73d YQ |
5453 | else if (errno == ESRCH) |
5454 | { | |
5455 | /* At this point, ESRCH should mean the process is | |
5456 | already gone, in which case we simply ignore attempts | |
5457 | to read its registers. */ | |
5458 | } | |
58caa3dc DJ |
5459 | else |
5460 | { | |
0d62e5e8 | 5461 | char s[256]; |
95954743 PA |
5462 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
5463 | pid); | |
0d62e5e8 | 5464 | perror (s); |
58caa3dc DJ |
5465 | } |
5466 | } | |
098dbe61 AA |
5467 | else |
5468 | { | |
5469 | if (regset->type == GENERAL_REGS) | |
5470 | saw_general_regs = 1; | |
5471 | regset->store_function (regcache, buf); | |
5472 | } | |
fdeb2a12 | 5473 | free (buf); |
58caa3dc | 5474 | } |
e9d25b98 DJ |
5475 | if (saw_general_regs) |
5476 | return 0; | |
5477 | else | |
5478 | return 1; | |
58caa3dc DJ |
5479 | } |
5480 | ||
5481 | static int | |
3aee8918 PA |
5482 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
5483 | struct regcache *regcache) | |
58caa3dc DJ |
5484 | { |
5485 | struct regset_info *regset; | |
e9d25b98 | 5486 | int saw_general_regs = 0; |
95954743 | 5487 | int pid; |
1570b33e | 5488 | struct iovec iov; |
58caa3dc | 5489 | |
0bfdf32f | 5490 | pid = lwpid_of (current_thread); |
28eef672 | 5491 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 5492 | { |
1570b33e L |
5493 | void *buf, *data; |
5494 | int nt_type, res; | |
58caa3dc | 5495 | |
feea5f36 AA |
5496 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
5497 | || regset->fill_function == NULL) | |
28eef672 | 5498 | continue; |
58caa3dc | 5499 | |
bca929d3 | 5500 | buf = xmalloc (regset->size); |
545587ee DJ |
5501 | |
5502 | /* First fill the buffer with the current register set contents, | |
5503 | in case there are any items in the kernel's regset that are | |
5504 | not in gdbserver's regcache. */ | |
1570b33e L |
5505 | |
5506 | nt_type = regset->nt_type; | |
5507 | if (nt_type) | |
5508 | { | |
5509 | iov.iov_base = buf; | |
5510 | iov.iov_len = regset->size; | |
5511 | data = (void *) &iov; | |
5512 | } | |
5513 | else | |
5514 | data = buf; | |
5515 | ||
dfb64f85 | 5516 | #ifndef __sparc__ |
f15f9948 | 5517 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5518 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5519 | #else |
689cc2ae | 5520 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5521 | #endif |
545587ee DJ |
5522 | |
5523 | if (res == 0) | |
5524 | { | |
5525 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5526 | regset->fill_function (regcache, buf); |
545587ee DJ |
5527 | |
5528 | /* Only now do we write the register set. */ | |
dfb64f85 | 5529 | #ifndef __sparc__ |
f15f9948 | 5530 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5531 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5532 | #else |
1570b33e | 5533 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5534 | #endif |
545587ee DJ |
5535 | } |
5536 | ||
58caa3dc DJ |
5537 | if (res < 0) |
5538 | { | |
5539 | if (errno == EIO) | |
5540 | { | |
52fa2412 | 5541 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5542 | this process mode. */ |
030031ee | 5543 | disable_regset (regsets_info, regset); |
58caa3dc | 5544 | } |
3221518c UW |
5545 | else if (errno == ESRCH) |
5546 | { | |
1b3f6016 PA |
5547 | /* At this point, ESRCH should mean the process is |
5548 | already gone, in which case we simply ignore attempts | |
5549 | to change its registers. See also the related | |
5550 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5551 | free (buf); |
3221518c UW |
5552 | return 0; |
5553 | } | |
58caa3dc DJ |
5554 | else |
5555 | { | |
ce3a066d | 5556 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5557 | } |
5558 | } | |
e9d25b98 DJ |
5559 | else if (regset->type == GENERAL_REGS) |
5560 | saw_general_regs = 1; | |
09ec9b38 | 5561 | free (buf); |
58caa3dc | 5562 | } |
e9d25b98 DJ |
5563 | if (saw_general_regs) |
5564 | return 0; | |
5565 | else | |
5566 | return 1; | |
58caa3dc DJ |
5567 | } |
5568 | ||
1faeff08 | 5569 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5570 | |
1faeff08 | 5571 | #define use_linux_regsets 0 |
3aee8918 PA |
5572 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5573 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5574 | |
58caa3dc | 5575 | #endif |
1faeff08 MR |
5576 | |
5577 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5578 | calls or 0 if it has to be transferred individually. */ | |
5579 | ||
5580 | static int | |
3aee8918 | 5581 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5582 | { |
5583 | unsigned char mask = 1 << (regno % 8); | |
5584 | size_t index = regno / 8; | |
5585 | ||
5586 | return (use_linux_regsets | |
3aee8918 PA |
5587 | && (regs_info->regset_bitmap == NULL |
5588 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5589 | } |
5590 | ||
58caa3dc | 5591 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 | 5592 | |
5b3da067 | 5593 | static int |
3aee8918 | 5594 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5595 | { |
5596 | int addr; | |
5597 | ||
3aee8918 | 5598 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5599 | error ("Invalid register number %d.", regnum); |
5600 | ||
3aee8918 | 5601 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5602 | |
5603 | return addr; | |
5604 | } | |
5605 | ||
5606 | /* Fetch one register. */ | |
5607 | static void | |
3aee8918 PA |
5608 | fetch_register (const struct usrregs_info *usrregs, |
5609 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5610 | { |
5611 | CORE_ADDR regaddr; | |
5612 | int i, size; | |
5613 | char *buf; | |
5614 | int pid; | |
5615 | ||
3aee8918 | 5616 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5617 | return; |
5618 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5619 | return; | |
5620 | ||
3aee8918 | 5621 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5622 | if (regaddr == -1) |
5623 | return; | |
5624 | ||
3aee8918 PA |
5625 | size = ((register_size (regcache->tdesc, regno) |
5626 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5627 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5628 | buf = (char *) alloca (size); |
1faeff08 | 5629 | |
0bfdf32f | 5630 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5631 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5632 | { | |
5633 | errno = 0; | |
5634 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5635 | ptrace (PTRACE_PEEKUSER, pid, | |
5636 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5637 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5638 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5639 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5640 | if (errno != 0) | |
5641 | error ("reading register %d: %s", regno, strerror (errno)); | |
5642 | } | |
5643 | ||
5644 | if (the_low_target.supply_ptrace_register) | |
5645 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5646 | else | |
5647 | supply_register (regcache, regno, buf); | |
5648 | } | |
5649 | ||
5650 | /* Store one register. */ | |
5651 | static void | |
3aee8918 PA |
5652 | store_register (const struct usrregs_info *usrregs, |
5653 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5654 | { |
5655 | CORE_ADDR regaddr; | |
5656 | int i, size; | |
5657 | char *buf; | |
5658 | int pid; | |
5659 | ||
3aee8918 | 5660 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5661 | return; |
5662 | if ((*the_low_target.cannot_store_register) (regno)) | |
5663 | return; | |
5664 | ||
3aee8918 | 5665 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5666 | if (regaddr == -1) |
5667 | return; | |
5668 | ||
3aee8918 PA |
5669 | size = ((register_size (regcache->tdesc, regno) |
5670 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5671 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5672 | buf = (char *) alloca (size); |
1faeff08 MR |
5673 | memset (buf, 0, size); |
5674 | ||
5675 | if (the_low_target.collect_ptrace_register) | |
5676 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5677 | else | |
5678 | collect_register (regcache, regno, buf); | |
5679 | ||
0bfdf32f | 5680 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5681 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5682 | { | |
5683 | errno = 0; | |
5684 | ptrace (PTRACE_POKEUSER, pid, | |
5685 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5686 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5687 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5688 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5689 | if (errno != 0) |
5690 | { | |
5691 | /* At this point, ESRCH should mean the process is | |
5692 | already gone, in which case we simply ignore attempts | |
5693 | to change its registers. See also the related | |
5694 | comment in linux_resume_one_lwp. */ | |
5695 | if (errno == ESRCH) | |
5696 | return; | |
5697 | ||
5698 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5699 | error ("writing register %d: %s", regno, strerror (errno)); | |
5700 | } | |
5701 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5702 | } | |
5703 | } | |
5704 | ||
5705 | /* Fetch all registers, or just one, from the child process. | |
5706 | If REGNO is -1, do this for all registers, skipping any that are | |
5707 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5708 | unless ALL is non-zero. | |
5709 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5710 | static void | |
3aee8918 PA |
5711 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5712 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5713 | { |
3aee8918 PA |
5714 | struct usrregs_info *usr = regs_info->usrregs; |
5715 | ||
1faeff08 MR |
5716 | if (regno == -1) |
5717 | { | |
3aee8918 PA |
5718 | for (regno = 0; regno < usr->num_regs; regno++) |
5719 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5720 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5721 | } |
5722 | else | |
3aee8918 | 5723 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5724 | } |
5725 | ||
5726 | /* Store our register values back into the inferior. | |
5727 | If REGNO is -1, do this for all registers, skipping any that are | |
5728 | assumed to have been saved by regsets_store_inferior_registers, | |
5729 | unless ALL is non-zero. | |
5730 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5731 | static void | |
3aee8918 PA |
5732 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5733 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5734 | { |
3aee8918 PA |
5735 | struct usrregs_info *usr = regs_info->usrregs; |
5736 | ||
1faeff08 MR |
5737 | if (regno == -1) |
5738 | { | |
3aee8918 PA |
5739 | for (regno = 0; regno < usr->num_regs; regno++) |
5740 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5741 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5742 | } |
5743 | else | |
3aee8918 | 5744 | store_register (usr, regcache, regno); |
1faeff08 MR |
5745 | } |
5746 | ||
5747 | #else /* !HAVE_LINUX_USRREGS */ | |
5748 | ||
3aee8918 PA |
5749 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5750 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5751 | |
58caa3dc | 5752 | #endif |
1faeff08 MR |
5753 | |
5754 | ||
5b3da067 | 5755 | static void |
1faeff08 MR |
5756 | linux_fetch_registers (struct regcache *regcache, int regno) |
5757 | { | |
5758 | int use_regsets; | |
5759 | int all = 0; | |
3aee8918 | 5760 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5761 | |
5762 | if (regno == -1) | |
5763 | { | |
3aee8918 PA |
5764 | if (the_low_target.fetch_register != NULL |
5765 | && regs_info->usrregs != NULL) | |
5766 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5767 | (*the_low_target.fetch_register) (regcache, regno); |
5768 | ||
3aee8918 PA |
5769 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5770 | if (regs_info->usrregs != NULL) | |
5771 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5772 | } |
5773 | else | |
5774 | { | |
c14dfd32 PA |
5775 | if (the_low_target.fetch_register != NULL |
5776 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5777 | return; | |
5778 | ||
3aee8918 | 5779 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5780 | if (use_regsets) |
3aee8918 PA |
5781 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5782 | regcache); | |
5783 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5784 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5785 | } |
58caa3dc DJ |
5786 | } |
5787 | ||
5b3da067 | 5788 | static void |
442ea881 | 5789 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5790 | { |
1faeff08 MR |
5791 | int use_regsets; |
5792 | int all = 0; | |
3aee8918 | 5793 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5794 | |
5795 | if (regno == -1) | |
5796 | { | |
3aee8918 PA |
5797 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5798 | regcache); | |
5799 | if (regs_info->usrregs != NULL) | |
5800 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5801 | } |
5802 | else | |
5803 | { | |
3aee8918 | 5804 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5805 | if (use_regsets) |
3aee8918 PA |
5806 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5807 | regcache); | |
5808 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5809 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5810 | } |
58caa3dc DJ |
5811 | } |
5812 | ||
da6d8c04 | 5813 | |
da6d8c04 DJ |
5814 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5815 | to debugger memory starting at MYADDR. */ | |
5816 | ||
c3e735a6 | 5817 | static int |
f450004a | 5818 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5819 | { |
0bfdf32f | 5820 | int pid = lwpid_of (current_thread); |
ae3e2ccf SM |
5821 | PTRACE_XFER_TYPE *buffer; |
5822 | CORE_ADDR addr; | |
5823 | int count; | |
4934b29e | 5824 | char filename[64]; |
ae3e2ccf | 5825 | int i; |
4934b29e | 5826 | int ret; |
fd462a61 | 5827 | int fd; |
fd462a61 DJ |
5828 | |
5829 | /* Try using /proc. Don't bother for one word. */ | |
5830 | if (len >= 3 * sizeof (long)) | |
5831 | { | |
4934b29e MR |
5832 | int bytes; |
5833 | ||
fd462a61 DJ |
5834 | /* We could keep this file open and cache it - possibly one per |
5835 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5836 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5837 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5838 | if (fd == -1) | |
5839 | goto no_proc; | |
5840 | ||
5841 | /* If pread64 is available, use it. It's faster if the kernel | |
5842 | supports it (only one syscall), and it's 64-bit safe even on | |
5843 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5844 | application). */ | |
5845 | #ifdef HAVE_PREAD64 | |
4934b29e | 5846 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5847 | #else |
4934b29e MR |
5848 | bytes = -1; |
5849 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5850 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5851 | #endif |
fd462a61 DJ |
5852 | |
5853 | close (fd); | |
4934b29e MR |
5854 | if (bytes == len) |
5855 | return 0; | |
5856 | ||
5857 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5858 | if (bytes > 0) | |
5859 | { | |
5860 | memaddr += bytes; | |
5861 | myaddr += bytes; | |
5862 | len -= bytes; | |
5863 | } | |
fd462a61 | 5864 | } |
da6d8c04 | 5865 | |
fd462a61 | 5866 | no_proc: |
4934b29e MR |
5867 | /* Round starting address down to longword boundary. */ |
5868 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5869 | /* Round ending address up; get number of longwords that makes. */ | |
5870 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5871 | / sizeof (PTRACE_XFER_TYPE)); | |
5872 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5873 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5874 | |
da6d8c04 | 5875 | /* Read all the longwords */ |
4934b29e | 5876 | errno = 0; |
da6d8c04 DJ |
5877 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5878 | { | |
14ce3065 DE |
5879 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5880 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5881 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5882 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5883 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5884 | if (errno) |
4934b29e | 5885 | break; |
da6d8c04 | 5886 | } |
4934b29e | 5887 | ret = errno; |
da6d8c04 DJ |
5888 | |
5889 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5890 | if (i > 0) |
5891 | { | |
5892 | i *= sizeof (PTRACE_XFER_TYPE); | |
5893 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5894 | memcpy (myaddr, | |
5895 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5896 | i < len ? i : len); | |
5897 | } | |
c3e735a6 | 5898 | |
4934b29e | 5899 | return ret; |
da6d8c04 DJ |
5900 | } |
5901 | ||
93ae6fdc PA |
5902 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5903 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5904 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5905 | |
ce3a066d | 5906 | static int |
f450004a | 5907 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 | 5908 | { |
ae3e2ccf | 5909 | int i; |
da6d8c04 | 5910 | /* Round starting address down to longword boundary. */ |
ae3e2ccf | 5911 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 5912 | /* Round ending address up; get number of longwords that makes. */ |
ae3e2ccf | 5913 | int count |
493e2a69 MS |
5914 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5915 | / sizeof (PTRACE_XFER_TYPE); | |
5916 | ||
da6d8c04 | 5917 | /* Allocate buffer of that many longwords. */ |
ae3e2ccf | 5918 | PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5919 | |
0bfdf32f | 5920 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5921 | |
f0ae6fc3 PA |
5922 | if (len == 0) |
5923 | { | |
5924 | /* Zero length write always succeeds. */ | |
5925 | return 0; | |
5926 | } | |
5927 | ||
0d62e5e8 DJ |
5928 | if (debug_threads) |
5929 | { | |
58d6951d | 5930 | /* Dump up to four bytes. */ |
bf47e248 PA |
5931 | char str[4 * 2 + 1]; |
5932 | char *p = str; | |
5933 | int dump = len < 4 ? len : 4; | |
5934 | ||
5935 | for (i = 0; i < dump; i++) | |
5936 | { | |
5937 | sprintf (p, "%02x", myaddr[i]); | |
5938 | p += 2; | |
5939 | } | |
5940 | *p = '\0'; | |
5941 | ||
5942 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5943 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5944 | } |
5945 | ||
da6d8c04 DJ |
5946 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5947 | ||
93ae6fdc | 5948 | errno = 0; |
14ce3065 DE |
5949 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5950 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5951 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5952 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5953 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5954 | if (errno) |
5955 | return errno; | |
da6d8c04 DJ |
5956 | |
5957 | if (count > 1) | |
5958 | { | |
93ae6fdc | 5959 | errno = 0; |
da6d8c04 | 5960 | buffer[count - 1] |
95954743 | 5961 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5962 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5963 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5964 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5965 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5966 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5967 | if (errno) |
5968 | return errno; | |
da6d8c04 DJ |
5969 | } |
5970 | ||
93ae6fdc | 5971 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5972 | |
493e2a69 MS |
5973 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5974 | myaddr, len); | |
da6d8c04 DJ |
5975 | |
5976 | /* Write the entire buffer. */ | |
5977 | ||
5978 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5979 | { | |
5980 | errno = 0; | |
14ce3065 DE |
5981 | ptrace (PTRACE_POKETEXT, pid, |
5982 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5983 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5984 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5985 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5986 | if (errno) |
5987 | return errno; | |
5988 | } | |
5989 | ||
5990 | return 0; | |
5991 | } | |
2f2893d9 DJ |
5992 | |
5993 | static void | |
5994 | linux_look_up_symbols (void) | |
5995 | { | |
0d62e5e8 | 5996 | #ifdef USE_THREAD_DB |
95954743 PA |
5997 | struct process_info *proc = current_process (); |
5998 | ||
fe978cb0 | 5999 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
6000 | return; |
6001 | ||
9b4c5f87 | 6002 | thread_db_init (); |
0d62e5e8 DJ |
6003 | #endif |
6004 | } | |
6005 | ||
e5379b03 | 6006 | static void |
ef57601b | 6007 | linux_request_interrupt (void) |
e5379b03 | 6008 | { |
78708b7c PA |
6009 | /* Send a SIGINT to the process group. This acts just like the user |
6010 | typed a ^C on the controlling terminal. */ | |
6011 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
6012 | } |
6013 | ||
aa691b87 RM |
6014 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
6015 | to debugger memory starting at MYADDR. */ | |
6016 | ||
6017 | static int | |
f450004a | 6018 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
6019 | { |
6020 | char filename[PATH_MAX]; | |
6021 | int fd, n; | |
0bfdf32f | 6022 | int pid = lwpid_of (current_thread); |
aa691b87 | 6023 | |
6cebaf6e | 6024 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
6025 | |
6026 | fd = open (filename, O_RDONLY); | |
6027 | if (fd < 0) | |
6028 | return -1; | |
6029 | ||
6030 | if (offset != (CORE_ADDR) 0 | |
6031 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6032 | n = -1; | |
6033 | else | |
6034 | n = read (fd, myaddr, len); | |
6035 | ||
6036 | close (fd); | |
6037 | ||
6038 | return n; | |
6039 | } | |
6040 | ||
d993e290 PA |
6041 | /* These breakpoint and watchpoint related wrapper functions simply |
6042 | pass on the function call if the target has registered a | |
6043 | corresponding function. */ | |
e013ee27 OF |
6044 | |
6045 | static int | |
802e8e6d PA |
6046 | linux_supports_z_point_type (char z_type) |
6047 | { | |
6048 | return (the_low_target.supports_z_point_type != NULL | |
6049 | && the_low_target.supports_z_point_type (z_type)); | |
6050 | } | |
6051 | ||
6052 | static int | |
6053 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
6054 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6055 | { |
c8f4bfdd YQ |
6056 | if (type == raw_bkpt_type_sw) |
6057 | return insert_memory_breakpoint (bp); | |
6058 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 6059 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
6060 | else |
6061 | /* Unsupported (see target.h). */ | |
6062 | return 1; | |
6063 | } | |
6064 | ||
6065 | static int | |
802e8e6d PA |
6066 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
6067 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 6068 | { |
c8f4bfdd YQ |
6069 | if (type == raw_bkpt_type_sw) |
6070 | return remove_memory_breakpoint (bp); | |
6071 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 6072 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
6073 | else |
6074 | /* Unsupported (see target.h). */ | |
6075 | return 1; | |
6076 | } | |
6077 | ||
3e572f71 PA |
6078 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
6079 | method. */ | |
6080 | ||
6081 | static int | |
6082 | linux_stopped_by_sw_breakpoint (void) | |
6083 | { | |
6084 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6085 | ||
6086 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
6087 | } | |
6088 | ||
6089 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
6090 | method. */ | |
6091 | ||
6092 | static int | |
6093 | linux_supports_stopped_by_sw_breakpoint (void) | |
6094 | { | |
6095 | return USE_SIGTRAP_SIGINFO; | |
6096 | } | |
6097 | ||
6098 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
6099 | method. */ | |
6100 | ||
6101 | static int | |
6102 | linux_stopped_by_hw_breakpoint (void) | |
6103 | { | |
6104 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
6105 | ||
6106 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
6107 | } | |
6108 | ||
6109 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
6110 | method. */ | |
6111 | ||
6112 | static int | |
6113 | linux_supports_stopped_by_hw_breakpoint (void) | |
6114 | { | |
6115 | return USE_SIGTRAP_SIGINFO; | |
6116 | } | |
6117 | ||
70b90b91 | 6118 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
6119 | |
6120 | static int | |
70b90b91 | 6121 | linux_supports_hardware_single_step (void) |
45614f15 | 6122 | { |
45614f15 YQ |
6123 | return can_hardware_single_step (); |
6124 | } | |
6125 | ||
7d00775e AT |
6126 | static int |
6127 | linux_supports_software_single_step (void) | |
6128 | { | |
6129 | return can_software_single_step (); | |
6130 | } | |
6131 | ||
e013ee27 OF |
6132 | static int |
6133 | linux_stopped_by_watchpoint (void) | |
6134 | { | |
0bfdf32f | 6135 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 6136 | |
15c66dd6 | 6137 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
6138 | } |
6139 | ||
6140 | static CORE_ADDR | |
6141 | linux_stopped_data_address (void) | |
6142 | { | |
0bfdf32f | 6143 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
6144 | |
6145 | return lwp->stopped_data_address; | |
e013ee27 OF |
6146 | } |
6147 | ||
db0dfaa0 LM |
6148 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6149 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6150 | && defined(PT_TEXT_END_ADDR) | |
6151 | ||
6152 | /* This is only used for targets that define PT_TEXT_ADDR, | |
6153 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
6154 | the target has different ways of acquiring this information, like | |
6155 | loadmaps. */ | |
52fb6437 NS |
6156 | |
6157 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
6158 | to tell gdb about. */ | |
6159 | ||
6160 | static int | |
6161 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
6162 | { | |
52fb6437 | 6163 | unsigned long text, text_end, data; |
62828379 | 6164 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
6165 | |
6166 | errno = 0; | |
6167 | ||
b8e1b30e LM |
6168 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
6169 | (PTRACE_TYPE_ARG4) 0); | |
6170 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
6171 | (PTRACE_TYPE_ARG4) 0); | |
6172 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
6173 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
6174 | |
6175 | if (errno == 0) | |
6176 | { | |
6177 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
6178 | used by gdb) are relative to the beginning of the program, |
6179 | with the data segment immediately following the text segment. | |
6180 | However, the actual runtime layout in memory may put the data | |
6181 | somewhere else, so when we send gdb a data base-address, we | |
6182 | use the real data base address and subtract the compile-time | |
6183 | data base-address from it (which is just the length of the | |
6184 | text segment). BSS immediately follows data in both | |
6185 | cases. */ | |
52fb6437 NS |
6186 | *text_p = text; |
6187 | *data_p = data - (text_end - text); | |
1b3f6016 | 6188 | |
52fb6437 NS |
6189 | return 1; |
6190 | } | |
52fb6437 NS |
6191 | return 0; |
6192 | } | |
6193 | #endif | |
6194 | ||
07e059b5 VP |
6195 | static int |
6196 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
6197 | unsigned char *readbuf, unsigned const char *writebuf, |
6198 | CORE_ADDR offset, int len) | |
07e059b5 | 6199 | { |
d26e3629 | 6200 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
6201 | } |
6202 | ||
d0722149 DE |
6203 | /* Convert a native/host siginfo object, into/from the siginfo in the |
6204 | layout of the inferiors' architecture. */ | |
6205 | ||
6206 | static void | |
8adce034 | 6207 | siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction) |
d0722149 DE |
6208 | { |
6209 | int done = 0; | |
6210 | ||
6211 | if (the_low_target.siginfo_fixup != NULL) | |
6212 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
6213 | ||
6214 | /* If there was no callback, or the callback didn't do anything, | |
6215 | then just do a straight memcpy. */ | |
6216 | if (!done) | |
6217 | { | |
6218 | if (direction == 1) | |
a5362b9a | 6219 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 6220 | else |
a5362b9a | 6221 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
6222 | } |
6223 | } | |
6224 | ||
4aa995e1 PA |
6225 | static int |
6226 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
6227 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
6228 | { | |
d0722149 | 6229 | int pid; |
a5362b9a | 6230 | siginfo_t siginfo; |
8adce034 | 6231 | gdb_byte inf_siginfo[sizeof (siginfo_t)]; |
4aa995e1 | 6232 | |
0bfdf32f | 6233 | if (current_thread == NULL) |
4aa995e1 PA |
6234 | return -1; |
6235 | ||
0bfdf32f | 6236 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
6237 | |
6238 | if (debug_threads) | |
87ce2a04 DE |
6239 | debug_printf ("%s siginfo for lwp %d.\n", |
6240 | readbuf != NULL ? "Reading" : "Writing", | |
6241 | pid); | |
4aa995e1 | 6242 | |
0adea5f7 | 6243 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
6244 | return -1; |
6245 | ||
b8e1b30e | 6246 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6247 | return -1; |
6248 | ||
d0722149 DE |
6249 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
6250 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
6251 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
6252 | with a 32-bit GDBSERVER, we need to convert it. */ | |
6253 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
6254 | ||
4aa995e1 PA |
6255 | if (offset + len > sizeof (siginfo)) |
6256 | len = sizeof (siginfo) - offset; | |
6257 | ||
6258 | if (readbuf != NULL) | |
d0722149 | 6259 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
6260 | else |
6261 | { | |
d0722149 DE |
6262 | memcpy (inf_siginfo + offset, writebuf, len); |
6263 | ||
6264 | /* Convert back to ptrace layout before flushing it out. */ | |
6265 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
6266 | ||
b8e1b30e | 6267 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
6268 | return -1; |
6269 | } | |
6270 | ||
6271 | return len; | |
6272 | } | |
6273 | ||
bd99dc85 PA |
6274 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
6275 | so we notice when children change state; as the handler for the | |
6276 | sigsuspend in my_waitpid. */ | |
6277 | ||
6278 | static void | |
6279 | sigchld_handler (int signo) | |
6280 | { | |
6281 | int old_errno = errno; | |
6282 | ||
6283 | if (debug_threads) | |
e581f2b4 PA |
6284 | { |
6285 | do | |
6286 | { | |
6287 | /* fprintf is not async-signal-safe, so call write | |
6288 | directly. */ | |
6289 | if (write (2, "sigchld_handler\n", | |
6290 | sizeof ("sigchld_handler\n") - 1) < 0) | |
6291 | break; /* just ignore */ | |
6292 | } while (0); | |
6293 | } | |
bd99dc85 PA |
6294 | |
6295 | if (target_is_async_p ()) | |
6296 | async_file_mark (); /* trigger a linux_wait */ | |
6297 | ||
6298 | errno = old_errno; | |
6299 | } | |
6300 | ||
6301 | static int | |
6302 | linux_supports_non_stop (void) | |
6303 | { | |
6304 | return 1; | |
6305 | } | |
6306 | ||
6307 | static int | |
6308 | linux_async (int enable) | |
6309 | { | |
7089dca4 | 6310 | int previous = target_is_async_p (); |
bd99dc85 | 6311 | |
8336d594 | 6312 | if (debug_threads) |
87ce2a04 DE |
6313 | debug_printf ("linux_async (%d), previous=%d\n", |
6314 | enable, previous); | |
8336d594 | 6315 | |
bd99dc85 PA |
6316 | if (previous != enable) |
6317 | { | |
6318 | sigset_t mask; | |
6319 | sigemptyset (&mask); | |
6320 | sigaddset (&mask, SIGCHLD); | |
6321 | ||
6322 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
6323 | ||
6324 | if (enable) | |
6325 | { | |
6326 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
6327 | { |
6328 | linux_event_pipe[0] = -1; | |
6329 | linux_event_pipe[1] = -1; | |
6330 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6331 | ||
6332 | warning ("creating event pipe failed."); | |
6333 | return previous; | |
6334 | } | |
bd99dc85 PA |
6335 | |
6336 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
6337 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
6338 | ||
6339 | /* Register the event loop handler. */ | |
6340 | add_file_handler (linux_event_pipe[0], | |
6341 | handle_target_event, NULL); | |
6342 | ||
6343 | /* Always trigger a linux_wait. */ | |
6344 | async_file_mark (); | |
6345 | } | |
6346 | else | |
6347 | { | |
6348 | delete_file_handler (linux_event_pipe[0]); | |
6349 | ||
6350 | close (linux_event_pipe[0]); | |
6351 | close (linux_event_pipe[1]); | |
6352 | linux_event_pipe[0] = -1; | |
6353 | linux_event_pipe[1] = -1; | |
6354 | } | |
6355 | ||
6356 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
6357 | } | |
6358 | ||
6359 | return previous; | |
6360 | } | |
6361 | ||
6362 | static int | |
6363 | linux_start_non_stop (int nonstop) | |
6364 | { | |
6365 | /* Register or unregister from event-loop accordingly. */ | |
6366 | linux_async (nonstop); | |
aa96c426 GB |
6367 | |
6368 | if (target_is_async_p () != (nonstop != 0)) | |
6369 | return -1; | |
6370 | ||
bd99dc85 PA |
6371 | return 0; |
6372 | } | |
6373 | ||
cf8fd78b PA |
6374 | static int |
6375 | linux_supports_multi_process (void) | |
6376 | { | |
6377 | return 1; | |
6378 | } | |
6379 | ||
89245bc0 DB |
6380 | /* Check if fork events are supported. */ |
6381 | ||
6382 | static int | |
6383 | linux_supports_fork_events (void) | |
6384 | { | |
6385 | return linux_supports_tracefork (); | |
6386 | } | |
6387 | ||
6388 | /* Check if vfork events are supported. */ | |
6389 | ||
6390 | static int | |
6391 | linux_supports_vfork_events (void) | |
6392 | { | |
6393 | return linux_supports_tracefork (); | |
6394 | } | |
6395 | ||
94585166 DB |
6396 | /* Check if exec events are supported. */ |
6397 | ||
6398 | static int | |
6399 | linux_supports_exec_events (void) | |
6400 | { | |
6401 | return linux_supports_traceexec (); | |
6402 | } | |
6403 | ||
de0d863e DB |
6404 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the |
6405 | ptrace flags for all inferiors. This is in case the new GDB connection | |
6406 | doesn't support the same set of events that the previous one did. */ | |
6407 | ||
6408 | static void | |
6409 | linux_handle_new_gdb_connection (void) | |
6410 | { | |
de0d863e | 6411 | /* Request that all the lwps reset their ptrace options. */ |
bbf550d5 SM |
6412 | for_each_thread ([] (thread_info *thread) |
6413 | { | |
6414 | struct lwp_info *lwp = get_thread_lwp (thread); | |
6415 | ||
6416 | if (!lwp->stopped) | |
6417 | { | |
6418 | /* Stop the lwp so we can modify its ptrace options. */ | |
6419 | lwp->must_set_ptrace_flags = 1; | |
6420 | linux_stop_lwp (lwp); | |
6421 | } | |
6422 | else | |
6423 | { | |
6424 | /* Already stopped; go ahead and set the ptrace options. */ | |
6425 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
6426 | int options = linux_low_ptrace_options (proc->attached); | |
6427 | ||
6428 | linux_enable_event_reporting (lwpid_of (thread), options); | |
6429 | lwp->must_set_ptrace_flags = 0; | |
6430 | } | |
6431 | }); | |
de0d863e DB |
6432 | } |
6433 | ||
03583c20 UW |
6434 | static int |
6435 | linux_supports_disable_randomization (void) | |
6436 | { | |
6437 | #ifdef HAVE_PERSONALITY | |
6438 | return 1; | |
6439 | #else | |
6440 | return 0; | |
6441 | #endif | |
6442 | } | |
efcbbd14 | 6443 | |
d1feda86 YQ |
6444 | static int |
6445 | linux_supports_agent (void) | |
6446 | { | |
6447 | return 1; | |
6448 | } | |
6449 | ||
c2d6af84 PA |
6450 | static int |
6451 | linux_supports_range_stepping (void) | |
6452 | { | |
c3805894 YQ |
6453 | if (can_software_single_step ()) |
6454 | return 1; | |
c2d6af84 PA |
6455 | if (*the_low_target.supports_range_stepping == NULL) |
6456 | return 0; | |
6457 | ||
6458 | return (*the_low_target.supports_range_stepping) (); | |
6459 | } | |
6460 | ||
efcbbd14 UW |
6461 | /* Enumerate spufs IDs for process PID. */ |
6462 | static int | |
6463 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
6464 | { | |
6465 | int pos = 0; | |
6466 | int written = 0; | |
6467 | char path[128]; | |
6468 | DIR *dir; | |
6469 | struct dirent *entry; | |
6470 | ||
6471 | sprintf (path, "/proc/%ld/fd", pid); | |
6472 | dir = opendir (path); | |
6473 | if (!dir) | |
6474 | return -1; | |
6475 | ||
6476 | rewinddir (dir); | |
6477 | while ((entry = readdir (dir)) != NULL) | |
6478 | { | |
6479 | struct stat st; | |
6480 | struct statfs stfs; | |
6481 | int fd; | |
6482 | ||
6483 | fd = atoi (entry->d_name); | |
6484 | if (!fd) | |
6485 | continue; | |
6486 | ||
6487 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
6488 | if (stat (path, &st) != 0) | |
6489 | continue; | |
6490 | if (!S_ISDIR (st.st_mode)) | |
6491 | continue; | |
6492 | ||
6493 | if (statfs (path, &stfs) != 0) | |
6494 | continue; | |
6495 | if (stfs.f_type != SPUFS_MAGIC) | |
6496 | continue; | |
6497 | ||
6498 | if (pos >= offset && pos + 4 <= offset + len) | |
6499 | { | |
6500 | *(unsigned int *)(buf + pos - offset) = fd; | |
6501 | written += 4; | |
6502 | } | |
6503 | pos += 4; | |
6504 | } | |
6505 | ||
6506 | closedir (dir); | |
6507 | return written; | |
6508 | } | |
6509 | ||
6510 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6511 | object type, using the /proc file system. */ | |
6512 | static int | |
6513 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6514 | unsigned const char *writebuf, | |
6515 | CORE_ADDR offset, int len) | |
6516 | { | |
0bfdf32f | 6517 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6518 | char buf[128]; |
6519 | int fd = 0; | |
6520 | int ret = 0; | |
6521 | ||
6522 | if (!writebuf && !readbuf) | |
6523 | return -1; | |
6524 | ||
6525 | if (!*annex) | |
6526 | { | |
6527 | if (!readbuf) | |
6528 | return -1; | |
6529 | else | |
6530 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6531 | } | |
6532 | ||
6533 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6534 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6535 | if (fd <= 0) | |
6536 | return -1; | |
6537 | ||
6538 | if (offset != 0 | |
6539 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6540 | { | |
6541 | close (fd); | |
6542 | return 0; | |
6543 | } | |
6544 | ||
6545 | if (writebuf) | |
6546 | ret = write (fd, writebuf, (size_t) len); | |
6547 | else | |
6548 | ret = read (fd, readbuf, (size_t) len); | |
6549 | ||
6550 | close (fd); | |
6551 | return ret; | |
6552 | } | |
6553 | ||
723b724b | 6554 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6555 | struct target_loadseg |
6556 | { | |
6557 | /* Core address to which the segment is mapped. */ | |
6558 | Elf32_Addr addr; | |
6559 | /* VMA recorded in the program header. */ | |
6560 | Elf32_Addr p_vaddr; | |
6561 | /* Size of this segment in memory. */ | |
6562 | Elf32_Word p_memsz; | |
6563 | }; | |
6564 | ||
723b724b | 6565 | # if defined PT_GETDSBT |
78d85199 YQ |
6566 | struct target_loadmap |
6567 | { | |
6568 | /* Protocol version number, must be zero. */ | |
6569 | Elf32_Word version; | |
6570 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6571 | unsigned *dsbt_table; | |
6572 | unsigned dsbt_size, dsbt_index; | |
6573 | /* Number of segments in this map. */ | |
6574 | Elf32_Word nsegs; | |
6575 | /* The actual memory map. */ | |
6576 | struct target_loadseg segs[/*nsegs*/]; | |
6577 | }; | |
723b724b MF |
6578 | # define LINUX_LOADMAP PT_GETDSBT |
6579 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6580 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6581 | # else | |
6582 | struct target_loadmap | |
6583 | { | |
6584 | /* Protocol version number, must be zero. */ | |
6585 | Elf32_Half version; | |
6586 | /* Number of segments in this map. */ | |
6587 | Elf32_Half nsegs; | |
6588 | /* The actual memory map. */ | |
6589 | struct target_loadseg segs[/*nsegs*/]; | |
6590 | }; | |
6591 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6592 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6593 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6594 | # endif | |
78d85199 | 6595 | |
78d85199 YQ |
6596 | static int |
6597 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6598 | unsigned char *myaddr, unsigned int len) | |
6599 | { | |
0bfdf32f | 6600 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6601 | int addr = -1; |
6602 | struct target_loadmap *data = NULL; | |
6603 | unsigned int actual_length, copy_length; | |
6604 | ||
6605 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6606 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6607 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6608 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6609 | else |
6610 | return -1; | |
6611 | ||
723b724b | 6612 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6613 | return -1; |
6614 | ||
6615 | if (data == NULL) | |
6616 | return -1; | |
6617 | ||
6618 | actual_length = sizeof (struct target_loadmap) | |
6619 | + sizeof (struct target_loadseg) * data->nsegs; | |
6620 | ||
6621 | if (offset < 0 || offset > actual_length) | |
6622 | return -1; | |
6623 | ||
6624 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6625 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6626 | return copy_length; | |
6627 | } | |
723b724b MF |
6628 | #else |
6629 | # define linux_read_loadmap NULL | |
6630 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6631 | |
1570b33e | 6632 | static void |
06e03fff | 6633 | linux_process_qsupported (char **features, int count) |
1570b33e L |
6634 | { |
6635 | if (the_low_target.process_qsupported != NULL) | |
06e03fff | 6636 | the_low_target.process_qsupported (features, count); |
1570b33e L |
6637 | } |
6638 | ||
82075af2 JS |
6639 | static int |
6640 | linux_supports_catch_syscall (void) | |
6641 | { | |
6642 | return (the_low_target.get_syscall_trapinfo != NULL | |
6643 | && linux_supports_tracesysgood ()); | |
6644 | } | |
6645 | ||
ae91f625 MK |
6646 | static int |
6647 | linux_get_ipa_tdesc_idx (void) | |
6648 | { | |
6649 | if (the_low_target.get_ipa_tdesc_idx == NULL) | |
6650 | return 0; | |
6651 | ||
6652 | return (*the_low_target.get_ipa_tdesc_idx) (); | |
6653 | } | |
6654 | ||
219f2f23 PA |
6655 | static int |
6656 | linux_supports_tracepoints (void) | |
6657 | { | |
6658 | if (*the_low_target.supports_tracepoints == NULL) | |
6659 | return 0; | |
6660 | ||
6661 | return (*the_low_target.supports_tracepoints) (); | |
6662 | } | |
6663 | ||
6664 | static CORE_ADDR | |
6665 | linux_read_pc (struct regcache *regcache) | |
6666 | { | |
6667 | if (the_low_target.get_pc == NULL) | |
6668 | return 0; | |
6669 | ||
6670 | return (*the_low_target.get_pc) (regcache); | |
6671 | } | |
6672 | ||
6673 | static void | |
6674 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6675 | { | |
6676 | gdb_assert (the_low_target.set_pc != NULL); | |
6677 | ||
6678 | (*the_low_target.set_pc) (regcache, pc); | |
6679 | } | |
6680 | ||
8336d594 PA |
6681 | static int |
6682 | linux_thread_stopped (struct thread_info *thread) | |
6683 | { | |
6684 | return get_thread_lwp (thread)->stopped; | |
6685 | } | |
6686 | ||
6687 | /* This exposes stop-all-threads functionality to other modules. */ | |
6688 | ||
6689 | static void | |
7984d532 | 6690 | linux_pause_all (int freeze) |
8336d594 | 6691 | { |
7984d532 PA |
6692 | stop_all_lwps (freeze, NULL); |
6693 | } | |
6694 | ||
6695 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6696 | modules. */ | |
6697 | ||
6698 | static void | |
6699 | linux_unpause_all (int unfreeze) | |
6700 | { | |
6701 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6702 | } |
6703 | ||
90d74c30 PA |
6704 | static int |
6705 | linux_prepare_to_access_memory (void) | |
6706 | { | |
6707 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6708 | running LWP. */ | |
6709 | if (non_stop) | |
6710 | linux_pause_all (1); | |
6711 | return 0; | |
6712 | } | |
6713 | ||
6714 | static void | |
0146f85b | 6715 | linux_done_accessing_memory (void) |
90d74c30 PA |
6716 | { |
6717 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6718 | running LWP. */ | |
6719 | if (non_stop) | |
6720 | linux_unpause_all (1); | |
6721 | } | |
6722 | ||
fa593d66 PA |
6723 | static int |
6724 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6725 | CORE_ADDR collector, | |
6726 | CORE_ADDR lockaddr, | |
6727 | ULONGEST orig_size, | |
6728 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6729 | CORE_ADDR *trampoline, |
6730 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6731 | unsigned char *jjump_pad_insn, |
6732 | ULONGEST *jjump_pad_insn_size, | |
6733 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6734 | CORE_ADDR *adjusted_insn_addr_end, |
6735 | char *err) | |
fa593d66 PA |
6736 | { |
6737 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6738 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6739 | jump_entry, trampoline, trampoline_size, |
6740 | jjump_pad_insn, jjump_pad_insn_size, | |
6741 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6742 | err); | |
fa593d66 PA |
6743 | } |
6744 | ||
6a271cae PA |
6745 | static struct emit_ops * |
6746 | linux_emit_ops (void) | |
6747 | { | |
6748 | if (the_low_target.emit_ops != NULL) | |
6749 | return (*the_low_target.emit_ops) (); | |
6750 | else | |
6751 | return NULL; | |
6752 | } | |
6753 | ||
405f8e94 SS |
6754 | static int |
6755 | linux_get_min_fast_tracepoint_insn_len (void) | |
6756 | { | |
6757 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6758 | } | |
6759 | ||
2268b414 JK |
6760 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6761 | ||
6762 | static int | |
6763 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6764 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6765 | { | |
6766 | char filename[PATH_MAX]; | |
6767 | int fd; | |
6768 | const int auxv_size = is_elf64 | |
6769 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6770 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6771 | ||
6772 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6773 | ||
6774 | fd = open (filename, O_RDONLY); | |
6775 | if (fd < 0) | |
6776 | return 1; | |
6777 | ||
6778 | *phdr_memaddr = 0; | |
6779 | *num_phdr = 0; | |
6780 | while (read (fd, buf, auxv_size) == auxv_size | |
6781 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6782 | { | |
6783 | if (is_elf64) | |
6784 | { | |
6785 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6786 | ||
6787 | switch (aux->a_type) | |
6788 | { | |
6789 | case AT_PHDR: | |
6790 | *phdr_memaddr = aux->a_un.a_val; | |
6791 | break; | |
6792 | case AT_PHNUM: | |
6793 | *num_phdr = aux->a_un.a_val; | |
6794 | break; | |
6795 | } | |
6796 | } | |
6797 | else | |
6798 | { | |
6799 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6800 | ||
6801 | switch (aux->a_type) | |
6802 | { | |
6803 | case AT_PHDR: | |
6804 | *phdr_memaddr = aux->a_un.a_val; | |
6805 | break; | |
6806 | case AT_PHNUM: | |
6807 | *num_phdr = aux->a_un.a_val; | |
6808 | break; | |
6809 | } | |
6810 | } | |
6811 | } | |
6812 | ||
6813 | close (fd); | |
6814 | ||
6815 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6816 | { | |
6817 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6818 | "phdr_memaddr = %ld, phdr_num = %d", | |
6819 | (long) *phdr_memaddr, *num_phdr); | |
6820 | return 2; | |
6821 | } | |
6822 | ||
6823 | return 0; | |
6824 | } | |
6825 | ||
6826 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6827 | ||
6828 | static CORE_ADDR | |
6829 | get_dynamic (const int pid, const int is_elf64) | |
6830 | { | |
6831 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6832 | int num_phdr, i; |
2268b414 | 6833 | unsigned char *phdr_buf; |
db1ff28b | 6834 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6835 | |
6836 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6837 | return 0; | |
6838 | ||
6839 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6840 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6841 | |
6842 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6843 | return 0; | |
6844 | ||
6845 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6846 | non-zero for PIE ones. */ | |
6847 | relocation = -1; | |
db1ff28b JK |
6848 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6849 | if (is_elf64) | |
6850 | { | |
6851 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6852 | ||
6853 | if (p->p_type == PT_PHDR) | |
6854 | relocation = phdr_memaddr - p->p_vaddr; | |
6855 | } | |
6856 | else | |
6857 | { | |
6858 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6859 | ||
6860 | if (p->p_type == PT_PHDR) | |
6861 | relocation = phdr_memaddr - p->p_vaddr; | |
6862 | } | |
6863 | ||
2268b414 JK |
6864 | if (relocation == -1) |
6865 | { | |
e237a7e2 JK |
6866 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6867 | any real world executables, including PIE executables, have always | |
6868 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6869 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6870 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6871 | ||
6872 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6873 | ||
6874 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6875 | ||
2268b414 JK |
6876 | return 0; |
6877 | } | |
6878 | ||
db1ff28b JK |
6879 | for (i = 0; i < num_phdr; i++) |
6880 | { | |
6881 | if (is_elf64) | |
6882 | { | |
6883 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6884 | ||
6885 | if (p->p_type == PT_DYNAMIC) | |
6886 | return p->p_vaddr + relocation; | |
6887 | } | |
6888 | else | |
6889 | { | |
6890 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6891 | |
db1ff28b JK |
6892 | if (p->p_type == PT_DYNAMIC) |
6893 | return p->p_vaddr + relocation; | |
6894 | } | |
6895 | } | |
2268b414 JK |
6896 | |
6897 | return 0; | |
6898 | } | |
6899 | ||
6900 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6901 | can be 0 if the inferior does not yet have the library list initialized. |
6902 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6903 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6904 | |
6905 | static CORE_ADDR | |
6906 | get_r_debug (const int pid, const int is_elf64) | |
6907 | { | |
6908 | CORE_ADDR dynamic_memaddr; | |
6909 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6910 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6911 | CORE_ADDR map = -1; |
2268b414 JK |
6912 | |
6913 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6914 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6915 | return map; |
2268b414 JK |
6916 | |
6917 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6918 | { | |
6919 | if (is_elf64) | |
6920 | { | |
6921 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6922 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6923 | union |
6924 | { | |
6925 | Elf64_Xword map; | |
6926 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6927 | } | |
6928 | rld_map; | |
a738da3a MF |
6929 | #endif |
6930 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6931 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6932 | { | |
6933 | if (linux_read_memory (dyn->d_un.d_val, | |
6934 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6935 | return rld_map.map; | |
6936 | else | |
6937 | break; | |
6938 | } | |
75f62ce7 | 6939 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6940 | #ifdef DT_MIPS_RLD_MAP_REL |
6941 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6942 | { | |
6943 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6944 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6945 | return rld_map.map; | |
6946 | else | |
6947 | break; | |
6948 | } | |
6949 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6950 | |
367ba2c2 MR |
6951 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6952 | map = dyn->d_un.d_val; | |
2268b414 JK |
6953 | |
6954 | if (dyn->d_tag == DT_NULL) | |
6955 | break; | |
6956 | } | |
6957 | else | |
6958 | { | |
6959 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6960 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6961 | union |
6962 | { | |
6963 | Elf32_Word map; | |
6964 | unsigned char buf[sizeof (Elf32_Word)]; | |
6965 | } | |
6966 | rld_map; | |
a738da3a MF |
6967 | #endif |
6968 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6969 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6970 | { | |
6971 | if (linux_read_memory (dyn->d_un.d_val, | |
6972 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6973 | return rld_map.map; | |
6974 | else | |
6975 | break; | |
6976 | } | |
75f62ce7 | 6977 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6978 | #ifdef DT_MIPS_RLD_MAP_REL |
6979 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6980 | { | |
6981 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6982 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6983 | return rld_map.map; | |
6984 | else | |
6985 | break; | |
6986 | } | |
6987 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6988 | |
367ba2c2 MR |
6989 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6990 | map = dyn->d_un.d_val; | |
2268b414 JK |
6991 | |
6992 | if (dyn->d_tag == DT_NULL) | |
6993 | break; | |
6994 | } | |
6995 | ||
6996 | dynamic_memaddr += dyn_size; | |
6997 | } | |
6998 | ||
367ba2c2 | 6999 | return map; |
2268b414 JK |
7000 | } |
7001 | ||
7002 | /* Read one pointer from MEMADDR in the inferior. */ | |
7003 | ||
7004 | static int | |
7005 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
7006 | { | |
485f1ee4 PA |
7007 | int ret; |
7008 | ||
7009 | /* Go through a union so this works on either big or little endian | |
7010 | hosts, when the inferior's pointer size is smaller than the size | |
7011 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
7012 | same of the superior's. */ | |
7013 | union | |
7014 | { | |
7015 | CORE_ADDR core_addr; | |
7016 | unsigned int ui; | |
7017 | unsigned char uc; | |
7018 | } addr; | |
7019 | ||
7020 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
7021 | if (ret == 0) | |
7022 | { | |
7023 | if (ptr_size == sizeof (CORE_ADDR)) | |
7024 | *ptr = addr.core_addr; | |
7025 | else if (ptr_size == sizeof (unsigned int)) | |
7026 | *ptr = addr.ui; | |
7027 | else | |
7028 | gdb_assert_not_reached ("unhandled pointer size"); | |
7029 | } | |
7030 | return ret; | |
2268b414 JK |
7031 | } |
7032 | ||
7033 | struct link_map_offsets | |
7034 | { | |
7035 | /* Offset and size of r_debug.r_version. */ | |
7036 | int r_version_offset; | |
7037 | ||
7038 | /* Offset and size of r_debug.r_map. */ | |
7039 | int r_map_offset; | |
7040 | ||
7041 | /* Offset to l_addr field in struct link_map. */ | |
7042 | int l_addr_offset; | |
7043 | ||
7044 | /* Offset to l_name field in struct link_map. */ | |
7045 | int l_name_offset; | |
7046 | ||
7047 | /* Offset to l_ld field in struct link_map. */ | |
7048 | int l_ld_offset; | |
7049 | ||
7050 | /* Offset to l_next field in struct link_map. */ | |
7051 | int l_next_offset; | |
7052 | ||
7053 | /* Offset to l_prev field in struct link_map. */ | |
7054 | int l_prev_offset; | |
7055 | }; | |
7056 | ||
fb723180 | 7057 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
7058 | |
7059 | static int | |
7060 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
7061 | unsigned const char *writebuf, | |
7062 | CORE_ADDR offset, int len) | |
7063 | { | |
7064 | char *document; | |
7065 | unsigned document_len; | |
fe978cb0 | 7066 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
7067 | char filename[PATH_MAX]; |
7068 | int pid, is_elf64; | |
7069 | ||
7070 | static const struct link_map_offsets lmo_32bit_offsets = | |
7071 | { | |
7072 | 0, /* r_version offset. */ | |
7073 | 4, /* r_debug.r_map offset. */ | |
7074 | 0, /* l_addr offset in link_map. */ | |
7075 | 4, /* l_name offset in link_map. */ | |
7076 | 8, /* l_ld offset in link_map. */ | |
7077 | 12, /* l_next offset in link_map. */ | |
7078 | 16 /* l_prev offset in link_map. */ | |
7079 | }; | |
7080 | ||
7081 | static const struct link_map_offsets lmo_64bit_offsets = | |
7082 | { | |
7083 | 0, /* r_version offset. */ | |
7084 | 8, /* r_debug.r_map offset. */ | |
7085 | 0, /* l_addr offset in link_map. */ | |
7086 | 8, /* l_name offset in link_map. */ | |
7087 | 16, /* l_ld offset in link_map. */ | |
7088 | 24, /* l_next offset in link_map. */ | |
7089 | 32 /* l_prev offset in link_map. */ | |
7090 | }; | |
7091 | const struct link_map_offsets *lmo; | |
214d508e | 7092 | unsigned int machine; |
b1fbec62 GB |
7093 | int ptr_size; |
7094 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
7095 | int allocated = 1024; | |
7096 | char *p; | |
7097 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
7098 | int header_done = 0; | |
2268b414 JK |
7099 | |
7100 | if (writebuf != NULL) | |
7101 | return -2; | |
7102 | if (readbuf == NULL) | |
7103 | return -1; | |
7104 | ||
0bfdf32f | 7105 | pid = lwpid_of (current_thread); |
2268b414 | 7106 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 7107 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 7108 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 7109 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 7110 | |
b1fbec62 GB |
7111 | while (annex[0] != '\0') |
7112 | { | |
7113 | const char *sep; | |
7114 | CORE_ADDR *addrp; | |
7115 | int len; | |
2268b414 | 7116 | |
b1fbec62 GB |
7117 | sep = strchr (annex, '='); |
7118 | if (sep == NULL) | |
7119 | break; | |
0c5bf5a9 | 7120 | |
b1fbec62 | 7121 | len = sep - annex; |
61012eef | 7122 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 7123 | addrp = &lm_addr; |
61012eef | 7124 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
7125 | addrp = &lm_prev; |
7126 | else | |
7127 | { | |
7128 | annex = strchr (sep, ';'); | |
7129 | if (annex == NULL) | |
7130 | break; | |
7131 | annex++; | |
7132 | continue; | |
7133 | } | |
7134 | ||
7135 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 7136 | } |
b1fbec62 GB |
7137 | |
7138 | if (lm_addr == 0) | |
2268b414 | 7139 | { |
b1fbec62 GB |
7140 | int r_version = 0; |
7141 | ||
7142 | if (priv->r_debug == 0) | |
7143 | priv->r_debug = get_r_debug (pid, is_elf64); | |
7144 | ||
7145 | /* We failed to find DT_DEBUG. Such situation will not change | |
7146 | for this inferior - do not retry it. Report it to GDB as | |
7147 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
7148 | if (priv->r_debug == (CORE_ADDR) -1) | |
7149 | return -1; | |
7150 | ||
7151 | if (priv->r_debug != 0) | |
2268b414 | 7152 | { |
b1fbec62 GB |
7153 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
7154 | (unsigned char *) &r_version, | |
7155 | sizeof (r_version)) != 0 | |
7156 | || r_version != 1) | |
7157 | { | |
7158 | warning ("unexpected r_debug version %d", r_version); | |
7159 | } | |
7160 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
7161 | &lm_addr, ptr_size) != 0) | |
7162 | { | |
7163 | warning ("unable to read r_map from 0x%lx", | |
7164 | (long) priv->r_debug + lmo->r_map_offset); | |
7165 | } | |
2268b414 | 7166 | } |
b1fbec62 | 7167 | } |
2268b414 | 7168 | |
224c3ddb | 7169 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
7170 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
7171 | p = document + strlen (document); | |
7172 | ||
7173 | while (lm_addr | |
7174 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
7175 | &l_name, ptr_size) == 0 | |
7176 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
7177 | &l_addr, ptr_size) == 0 | |
7178 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
7179 | &l_ld, ptr_size) == 0 | |
7180 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
7181 | &l_prev, ptr_size) == 0 | |
7182 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
7183 | &l_next, ptr_size) == 0) | |
7184 | { | |
7185 | unsigned char libname[PATH_MAX]; | |
7186 | ||
7187 | if (lm_prev != l_prev) | |
2268b414 | 7188 | { |
b1fbec62 GB |
7189 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
7190 | (long) lm_prev, (long) l_prev); | |
7191 | break; | |
2268b414 JK |
7192 | } |
7193 | ||
d878444c JK |
7194 | /* Ignore the first entry even if it has valid name as the first entry |
7195 | corresponds to the main executable. The first entry should not be | |
7196 | skipped if the dynamic loader was loaded late by a static executable | |
7197 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
7198 | executable does not have PT_DYNAMIC present and this function already | |
7199 | exited above due to failed get_r_debug. */ | |
7200 | if (lm_prev == 0) | |
2268b414 | 7201 | { |
d878444c JK |
7202 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
7203 | p = p + strlen (p); | |
7204 | } | |
7205 | else | |
7206 | { | |
7207 | /* Not checking for error because reading may stop before | |
7208 | we've got PATH_MAX worth of characters. */ | |
7209 | libname[0] = '\0'; | |
7210 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
7211 | libname[sizeof (libname) - 1] = '\0'; | |
7212 | if (libname[0] != '\0') | |
2268b414 | 7213 | { |
d878444c JK |
7214 | /* 6x the size for xml_escape_text below. */ |
7215 | size_t len = 6 * strlen ((char *) libname); | |
2268b414 | 7216 | |
d878444c JK |
7217 | if (!header_done) |
7218 | { | |
7219 | /* Terminate `<library-list-svr4'. */ | |
7220 | *p++ = '>'; | |
7221 | header_done = 1; | |
7222 | } | |
2268b414 | 7223 | |
db1ff28b | 7224 | while (allocated < p - document + len + 200) |
d878444c JK |
7225 | { |
7226 | /* Expand to guarantee sufficient storage. */ | |
7227 | uintptr_t document_len = p - document; | |
2268b414 | 7228 | |
224c3ddb | 7229 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
7230 | allocated *= 2; |
7231 | p = document + document_len; | |
7232 | } | |
7233 | ||
5e187554 | 7234 | std::string name = xml_escape_text ((char *) libname); |
d878444c | 7235 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " |
db1ff28b | 7236 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
5e187554 | 7237 | name.c_str (), (unsigned long) lm_addr, |
d878444c | 7238 | (unsigned long) l_addr, (unsigned long) l_ld); |
d878444c | 7239 | } |
0afae3cf | 7240 | } |
b1fbec62 GB |
7241 | |
7242 | lm_prev = lm_addr; | |
7243 | lm_addr = l_next; | |
2268b414 JK |
7244 | } |
7245 | ||
b1fbec62 GB |
7246 | if (!header_done) |
7247 | { | |
7248 | /* Empty list; terminate `<library-list-svr4'. */ | |
7249 | strcpy (p, "/>"); | |
7250 | } | |
7251 | else | |
7252 | strcpy (p, "</library-list-svr4>"); | |
7253 | ||
2268b414 JK |
7254 | document_len = strlen (document); |
7255 | if (offset < document_len) | |
7256 | document_len -= offset; | |
7257 | else | |
7258 | document_len = 0; | |
7259 | if (len > document_len) | |
7260 | len = document_len; | |
7261 | ||
7262 | memcpy (readbuf, document + offset, len); | |
7263 | xfree (document); | |
7264 | ||
7265 | return len; | |
7266 | } | |
7267 | ||
9accd112 MM |
7268 | #ifdef HAVE_LINUX_BTRACE |
7269 | ||
969c39fb | 7270 | /* See to_disable_btrace target method. */ |
9accd112 | 7271 | |
969c39fb MM |
7272 | static int |
7273 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
7274 | { | |
7275 | enum btrace_error err; | |
7276 | ||
7277 | err = linux_disable_btrace (tinfo); | |
7278 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
7279 | } | |
7280 | ||
bc504a31 | 7281 | /* Encode an Intel Processor Trace configuration. */ |
b20a6524 MM |
7282 | |
7283 | static void | |
7284 | linux_low_encode_pt_config (struct buffer *buffer, | |
7285 | const struct btrace_data_pt_config *config) | |
7286 | { | |
7287 | buffer_grow_str (buffer, "<pt-config>\n"); | |
7288 | ||
7289 | switch (config->cpu.vendor) | |
7290 | { | |
7291 | case CV_INTEL: | |
7292 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
7293 | "model=\"%u\" stepping=\"%u\"/>\n", | |
7294 | config->cpu.family, config->cpu.model, | |
7295 | config->cpu.stepping); | |
7296 | break; | |
7297 | ||
7298 | default: | |
7299 | break; | |
7300 | } | |
7301 | ||
7302 | buffer_grow_str (buffer, "</pt-config>\n"); | |
7303 | } | |
7304 | ||
7305 | /* Encode a raw buffer. */ | |
7306 | ||
7307 | static void | |
7308 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
7309 | unsigned int size) | |
7310 | { | |
7311 | if (size == 0) | |
7312 | return; | |
7313 | ||
7314 | /* We use hex encoding - see common/rsp-low.h. */ | |
7315 | buffer_grow_str (buffer, "<raw>\n"); | |
7316 | ||
7317 | while (size-- > 0) | |
7318 | { | |
7319 | char elem[2]; | |
7320 | ||
7321 | elem[0] = tohex ((*data >> 4) & 0xf); | |
7322 | elem[1] = tohex (*data++ & 0xf); | |
7323 | ||
7324 | buffer_grow (buffer, elem, 2); | |
7325 | } | |
7326 | ||
7327 | buffer_grow_str (buffer, "</raw>\n"); | |
7328 | } | |
7329 | ||
969c39fb MM |
7330 | /* See to_read_btrace target method. */ |
7331 | ||
7332 | static int | |
9accd112 | 7333 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
add67df8 | 7334 | enum btrace_read_type type) |
9accd112 | 7335 | { |
734b0e4b | 7336 | struct btrace_data btrace; |
9accd112 | 7337 | struct btrace_block *block; |
969c39fb | 7338 | enum btrace_error err; |
9accd112 MM |
7339 | int i; |
7340 | ||
734b0e4b MM |
7341 | btrace_data_init (&btrace); |
7342 | ||
969c39fb MM |
7343 | err = linux_read_btrace (&btrace, tinfo, type); |
7344 | if (err != BTRACE_ERR_NONE) | |
7345 | { | |
7346 | if (err == BTRACE_ERR_OVERFLOW) | |
7347 | buffer_grow_str0 (buffer, "E.Overflow."); | |
7348 | else | |
7349 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
7350 | ||
b20a6524 | 7351 | goto err; |
969c39fb | 7352 | } |
9accd112 | 7353 | |
734b0e4b MM |
7354 | switch (btrace.format) |
7355 | { | |
7356 | case BTRACE_FORMAT_NONE: | |
7357 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 7358 | goto err; |
734b0e4b MM |
7359 | |
7360 | case BTRACE_FORMAT_BTS: | |
7361 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7362 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 7363 | |
734b0e4b MM |
7364 | for (i = 0; |
7365 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
7366 | i++) | |
7367 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
7368 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 7369 | |
734b0e4b MM |
7370 | buffer_grow_str0 (buffer, "</btrace>\n"); |
7371 | break; | |
7372 | ||
b20a6524 MM |
7373 | case BTRACE_FORMAT_PT: |
7374 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
7375 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
7376 | buffer_grow_str (buffer, "<pt>\n"); | |
7377 | ||
7378 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 7379 | |
b20a6524 MM |
7380 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
7381 | btrace.variant.pt.size); | |
7382 | ||
7383 | buffer_grow_str (buffer, "</pt>\n"); | |
7384 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
7385 | break; | |
7386 | ||
7387 | default: | |
7388 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
7389 | goto err; | |
734b0e4b | 7390 | } |
969c39fb | 7391 | |
734b0e4b | 7392 | btrace_data_fini (&btrace); |
969c39fb | 7393 | return 0; |
b20a6524 MM |
7394 | |
7395 | err: | |
7396 | btrace_data_fini (&btrace); | |
7397 | return -1; | |
9accd112 | 7398 | } |
f4abbc16 MM |
7399 | |
7400 | /* See to_btrace_conf target method. */ | |
7401 | ||
7402 | static int | |
7403 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
7404 | struct buffer *buffer) | |
7405 | { | |
7406 | const struct btrace_config *conf; | |
7407 | ||
7408 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
7409 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
7410 | ||
7411 | conf = linux_btrace_conf (tinfo); | |
7412 | if (conf != NULL) | |
7413 | { | |
7414 | switch (conf->format) | |
7415 | { | |
7416 | case BTRACE_FORMAT_NONE: | |
7417 | break; | |
7418 | ||
7419 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
7420 | buffer_xml_printf (buffer, "<bts"); |
7421 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
7422 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 7423 | break; |
b20a6524 MM |
7424 | |
7425 | case BTRACE_FORMAT_PT: | |
7426 | buffer_xml_printf (buffer, "<pt"); | |
7427 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
7428 | buffer_xml_printf (buffer, "/>\n"); | |
7429 | break; | |
f4abbc16 MM |
7430 | } |
7431 | } | |
7432 | ||
7433 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
7434 | return 0; | |
7435 | } | |
9accd112 MM |
7436 | #endif /* HAVE_LINUX_BTRACE */ |
7437 | ||
7b669087 GB |
7438 | /* See nat/linux-nat.h. */ |
7439 | ||
7440 | ptid_t | |
7441 | current_lwp_ptid (void) | |
7442 | { | |
7443 | return ptid_of (current_thread); | |
7444 | } | |
7445 | ||
dd373349 AT |
7446 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
7447 | ||
7448 | static int | |
7449 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
7450 | { | |
7451 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
7452 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
7453 | else | |
1652a986 | 7454 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
7455 | } |
7456 | ||
7457 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
7458 | ||
7459 | static const gdb_byte * | |
7460 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
7461 | { | |
7462 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
7463 | ||
7464 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
7465 | } | |
7466 | ||
769ef81f AT |
7467 | /* Implementation of the target_ops method |
7468 | "breakpoint_kind_from_current_state". */ | |
7469 | ||
7470 | static int | |
7471 | linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
7472 | { | |
7473 | if (the_low_target.breakpoint_kind_from_current_state != NULL) | |
7474 | return (*the_low_target.breakpoint_kind_from_current_state) (pcptr); | |
7475 | else | |
7476 | return linux_breakpoint_kind_from_pc (pcptr); | |
7477 | } | |
7478 | ||
276d4552 YQ |
7479 | /* Default implementation of linux_target_ops method "set_pc" for |
7480 | 32-bit pc register which is literally named "pc". */ | |
7481 | ||
7482 | void | |
7483 | linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc) | |
7484 | { | |
7485 | uint32_t newpc = pc; | |
7486 | ||
7487 | supply_register_by_name (regcache, "pc", &newpc); | |
7488 | } | |
7489 | ||
7490 | /* Default implementation of linux_target_ops method "get_pc" for | |
7491 | 32-bit pc register which is literally named "pc". */ | |
7492 | ||
7493 | CORE_ADDR | |
7494 | linux_get_pc_32bit (struct regcache *regcache) | |
7495 | { | |
7496 | uint32_t pc; | |
7497 | ||
7498 | collect_register_by_name (regcache, "pc", &pc); | |
7499 | if (debug_threads) | |
7500 | debug_printf ("stop pc is 0x%" PRIx32 "\n", pc); | |
7501 | return pc; | |
7502 | } | |
7503 | ||
6f69e520 YQ |
7504 | /* Default implementation of linux_target_ops method "set_pc" for |
7505 | 64-bit pc register which is literally named "pc". */ | |
7506 | ||
7507 | void | |
7508 | linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc) | |
7509 | { | |
7510 | uint64_t newpc = pc; | |
7511 | ||
7512 | supply_register_by_name (regcache, "pc", &newpc); | |
7513 | } | |
7514 | ||
7515 | /* Default implementation of linux_target_ops method "get_pc" for | |
7516 | 64-bit pc register which is literally named "pc". */ | |
7517 | ||
7518 | CORE_ADDR | |
7519 | linux_get_pc_64bit (struct regcache *regcache) | |
7520 | { | |
7521 | uint64_t pc; | |
7522 | ||
7523 | collect_register_by_name (regcache, "pc", &pc); | |
7524 | if (debug_threads) | |
7525 | debug_printf ("stop pc is 0x%" PRIx64 "\n", pc); | |
7526 | return pc; | |
7527 | } | |
7528 | ||
7529 | ||
ce3a066d DJ |
7530 | static struct target_ops linux_target_ops = { |
7531 | linux_create_inferior, | |
ece66d65 | 7532 | linux_post_create_inferior, |
ce3a066d DJ |
7533 | linux_attach, |
7534 | linux_kill, | |
6ad8ae5c | 7535 | linux_detach, |
8336d594 | 7536 | linux_mourn, |
444d6139 | 7537 | linux_join, |
ce3a066d DJ |
7538 | linux_thread_alive, |
7539 | linux_resume, | |
7540 | linux_wait, | |
7541 | linux_fetch_registers, | |
7542 | linux_store_registers, | |
90d74c30 | 7543 | linux_prepare_to_access_memory, |
0146f85b | 7544 | linux_done_accessing_memory, |
ce3a066d DJ |
7545 | linux_read_memory, |
7546 | linux_write_memory, | |
2f2893d9 | 7547 | linux_look_up_symbols, |
ef57601b | 7548 | linux_request_interrupt, |
aa691b87 | 7549 | linux_read_auxv, |
802e8e6d | 7550 | linux_supports_z_point_type, |
d993e290 PA |
7551 | linux_insert_point, |
7552 | linux_remove_point, | |
3e572f71 PA |
7553 | linux_stopped_by_sw_breakpoint, |
7554 | linux_supports_stopped_by_sw_breakpoint, | |
7555 | linux_stopped_by_hw_breakpoint, | |
7556 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 7557 | linux_supports_hardware_single_step, |
e013ee27 OF |
7558 | linux_stopped_by_watchpoint, |
7559 | linux_stopped_data_address, | |
db0dfaa0 LM |
7560 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
7561 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
7562 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 7563 | linux_read_offsets, |
dae5f5cf DJ |
7564 | #else |
7565 | NULL, | |
7566 | #endif | |
7567 | #ifdef USE_THREAD_DB | |
7568 | thread_db_get_tls_address, | |
7569 | #else | |
7570 | NULL, | |
52fb6437 | 7571 | #endif |
efcbbd14 | 7572 | linux_qxfer_spu, |
59a016f0 | 7573 | hostio_last_error_from_errno, |
07e059b5 | 7574 | linux_qxfer_osdata, |
4aa995e1 | 7575 | linux_xfer_siginfo, |
bd99dc85 PA |
7576 | linux_supports_non_stop, |
7577 | linux_async, | |
7578 | linux_start_non_stop, | |
cdbfd419 | 7579 | linux_supports_multi_process, |
89245bc0 DB |
7580 | linux_supports_fork_events, |
7581 | linux_supports_vfork_events, | |
94585166 | 7582 | linux_supports_exec_events, |
de0d863e | 7583 | linux_handle_new_gdb_connection, |
cdbfd419 | 7584 | #ifdef USE_THREAD_DB |
dc146f7c | 7585 | thread_db_handle_monitor_command, |
cdbfd419 | 7586 | #else |
dc146f7c | 7587 | NULL, |
cdbfd419 | 7588 | #endif |
d26e3629 | 7589 | linux_common_core_of_thread, |
78d85199 | 7590 | linux_read_loadmap, |
219f2f23 PA |
7591 | linux_process_qsupported, |
7592 | linux_supports_tracepoints, | |
7593 | linux_read_pc, | |
8336d594 PA |
7594 | linux_write_pc, |
7595 | linux_thread_stopped, | |
7984d532 | 7596 | NULL, |
711e434b | 7597 | linux_pause_all, |
7984d532 | 7598 | linux_unpause_all, |
fa593d66 | 7599 | linux_stabilize_threads, |
6a271cae | 7600 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7601 | linux_emit_ops, |
7602 | linux_supports_disable_randomization, | |
405f8e94 | 7603 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7604 | linux_qxfer_libraries_svr4, |
d1feda86 | 7605 | linux_supports_agent, |
9accd112 MM |
7606 | #ifdef HAVE_LINUX_BTRACE |
7607 | linux_supports_btrace, | |
0568462b | 7608 | linux_enable_btrace, |
969c39fb | 7609 | linux_low_disable_btrace, |
9accd112 | 7610 | linux_low_read_btrace, |
f4abbc16 | 7611 | linux_low_btrace_conf, |
9accd112 MM |
7612 | #else |
7613 | NULL, | |
7614 | NULL, | |
7615 | NULL, | |
7616 | NULL, | |
f4abbc16 | 7617 | NULL, |
9accd112 | 7618 | #endif |
c2d6af84 | 7619 | linux_supports_range_stepping, |
e57f1de3 | 7620 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7621 | linux_mntns_open_cloexec, |
7622 | linux_mntns_unlink, | |
7623 | linux_mntns_readlink, | |
dd373349 | 7624 | linux_breakpoint_kind_from_pc, |
79efa585 SM |
7625 | linux_sw_breakpoint_from_kind, |
7626 | linux_proc_tid_get_name, | |
7d00775e | 7627 | linux_breakpoint_kind_from_current_state, |
82075af2 JS |
7628 | linux_supports_software_single_step, |
7629 | linux_supports_catch_syscall, | |
ae91f625 | 7630 | linux_get_ipa_tdesc_idx, |
f6327dcb KB |
7631 | #if USE_THREAD_DB |
7632 | thread_db_thread_handle, | |
7633 | #else | |
7634 | NULL, | |
7635 | #endif | |
ce3a066d DJ |
7636 | }; |
7637 | ||
3aee8918 PA |
7638 | #ifdef HAVE_LINUX_REGSETS |
7639 | void | |
7640 | initialize_regsets_info (struct regsets_info *info) | |
7641 | { | |
7642 | for (info->num_regsets = 0; | |
7643 | info->regsets[info->num_regsets].size >= 0; | |
7644 | info->num_regsets++) | |
7645 | ; | |
3aee8918 PA |
7646 | } |
7647 | #endif | |
7648 | ||
da6d8c04 DJ |
7649 | void |
7650 | initialize_low (void) | |
7651 | { | |
bd99dc85 | 7652 | struct sigaction sigchld_action; |
dd373349 | 7653 | |
bd99dc85 | 7654 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7655 | set_target_ops (&linux_target_ops); |
dd373349 | 7656 | |
aa7c7447 | 7657 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7658 | |
7659 | sigchld_action.sa_handler = sigchld_handler; | |
7660 | sigemptyset (&sigchld_action.sa_mask); | |
7661 | sigchld_action.sa_flags = SA_RESTART; | |
7662 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7663 | |
7664 | initialize_low_arch (); | |
89245bc0 DB |
7665 | |
7666 | linux_check_ptrace_features (); | |
da6d8c04 | 7667 | } |